I would must be followed by an infinitive without to ( or perfect infinitive as in I would have gone). I had must be followed either by an object (a noun phrase, e.g. I had a little lamb, in which meaning it is rarely contracted) or by a verb's past participle. So it's (almost) always possible to distinguish between them by analyzing the words that follow.

Examples:

I'd go. (go = infinitive => 'd = would)

I'd had. (had = participle => 'd = had)

The only ambiguous case is when the verb's infinitive coincides with its participle.

I'd put. (could be would or had)

But these cases are rare and the meaning can be deduced if more context is provided

Answer from Armen Ծիրունյան on Stack Exchange
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Grammarly
grammarly.com › blog › grammar › contractions
What Are Contractions in Writing? Definition and Examples | Grammarly
August 10, 2022 - Some of the most common contractions in English include can’t, it’s, they’ve, what’s, and would’ve.
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What are some examples of contractions?
Some of the most common contractions in English include can’t, it’s, they’ve, what’s, and would’ve.
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grammarly.com
grammarly.com › blog › grammar › contractions
What Are Contractions in Writing? Definition and Examples | Grammarly
What is the difference between an abbreviation and a contraction?
Abbreviations and contractions are both used to shorten a word, but in different ways. · An abbreviation is formed using the initial letters (or sometimes other parts) of a longer word or phrase to represent the whole. Common examples include “Mr.” for “Mister,” “Dr.” for “Doctor,” and “NASA” for “National Aeronautics and Space Administration.” They are used in formal writing as well as everyday conversations. · A contraction, on the other hand, is formed by combining two words and omitting one or more letters. The deleted letters are replaced with an apostrophe (e.g., “cannot” becomes “can’t”
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scribbr.com
scribbr.com › home › contractions (grammar) | definition & examples
Contractions (Grammar) | Definition & Examples
When should you use contractions?
Contractions are considered informal, so they should not be used in formal writing like academic papers.
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grammarly.com
grammarly.com › blog › grammar › contractions
What Are Contractions in Writing? Definition and Examples | Grammarly
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Speakspeak
speakspeak.com › resources › english-grammar-rules › various-grammar-rules › apostrophe-d-had-or-would
‘d = “had” or “would”
May 15, 2018 - The contraction I'd can mean "I would" or "I had". Here are some similar examples: You'd = you would or you had He'd = he would or he had She'd = she would or she had It'd = it would or it had We'd = we would or we had They'd = they would or…
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San Jose State University
sjsu.edu › writingcenter › docs › handouts › Contractions.pdf pdf
San José State University Writing Center www.sjsu.edu/writingcenter
1. I have been studying for hours, but I still do not feel ready for the exam. ... Each of the following sentences contains one or more contraction(s).
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Wikipedia
en.wikipedia.org › wiki › Wikipedia:List_of_English_contractions
Wikipedia:List of English contractions - Wikipedia
This list is part of the internal Wikipedia Manual of Style. For encyclopedic information see English auxiliaries and contractions. This is a list of contractions used in the Wikipedia:Manual of Style/Abbreviations; these are to be avoided anywhere other than in direct quotations in encyclopedic ...
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Grammarplainandsimple
grammarplainandsimple.com › home › words › 1067. contractions with would
1067. Contractions with Would - Grammar, Plain and Simple
May 20, 2025 - When joining two words to make the contraction with would, we take out the letters woul.I would = I'dyou would = you'dhe would = he'dshe would = she'dthey would = they'dwe would = we'd Look at these sentence examples:I would help you if I could.I'd ...
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Scribbr
scribbr.com › home › contractions (grammar) | definition & examples
Contractions (Grammar) | Definition & Examples
May 2, 2025 - A positive contraction is a verb construction that doesn’t end in “-n’t” (e.g., “he would join us” becomes “he’d join us”). Positive contractions can never appear at the end of a sentence. ... I think we’re almost there. We’re almost there. I think we’re. NoteSome contractions have more than one possible meaning. For example, “she’d” can mean “she had” or “she would.” The correct meaning is usually clear from the context of the sentence.
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engVid
engvid.com › contractions-for-have-be-would-will
CONTRACTIONS for HAVE, BE, WOULD, WILL: ’d, ’s, ’ve, ’re, ’m, ’ll engVid
Like in these two examples: 1) He sad he’d(had)put it on the table. 2) He sad he’d(would)put it on the table. Do we guess the right meaning only from the context? ... thanks James for this lesson I got 9/10 all ‘Lycan’ tell you is that you ‘rock’ some pokemon jokes from Lycanrock lol. :) ... 8 out of 10 I think that’t not bad. I have a question and it is can you do contraction in all writing?
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WordReference
forum.wordreference.com › english only › english only
It'd = It would? [Contraction with 'would'] | WordReference Forums
January 12, 2017 - I would= I'd You would = You'd He would = He'd She would = She'd We would = We'd They would= They'd What about for the pronoun " it " ? The authors didn't give any examples for " it " in their grammar book.
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University of Sussex
sussex.ac.uk › informatics › punctuation › apostrophe › contractions
Contractions : The Apostrophe
Others, however, are perfectly normal in formal writing: even the most dignified music critic would call Ofra Harnoy's instrument a cello; he would no more use violoncello than he would apply the word omnibus to a London double-decker. Important note: Contractions must also be carefully distinguished from abbreviations. Abbreviations are things like Mr for Mister, lb. for pound(s), bc for before Christ and e.g. for for example.
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Langeek
langeek.co › home › grammar › punctuation and spelling › contractions
"Contractions" in English Grammar | LanGeek
3 weeks ago - Some of them might be so popular among English speakers that they become well-known and understandable everywhere, but others might be only understandable to people of specific regions. When we use abbreviations, we are actually using a special form for a specific word or phrase. But when we use contractions, we are using a single word as a combination for ... Wanna stands for 'want' and 'to'. If the contractions are confusing, it's better to avoid them. For example: "she'd" can be both "she had" and "she would", so if the context of the sentence cannot clarify which meaning is intended, it's best to avoid using it.
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engVid
engvid.com › speak-english-would-contractions
Speak English Naturally with WOULD contractions: I’D, YOU’D, HE’D… engVid
I’d = I would/ I had. It’s not BECAUSE there are MISSING letters. You’re, he’s… are contractions. Is it BECAUSE there are missing letters. Really? I don’t get it. Why don’t you explain that silly thing? It’s up to you. I’m a student, not an omniscient teacher. ... Thanks a lot! This informatiom was veru useful. ... Emma i have to say you thanks , you have helped me with this lesson . I really have a problem with the pronunciation of : I’d , You’d ……
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EC English
ecenglish.com › learnenglish › lessons › contractions
Contractions | Learn English
One or more letters are removed from the words when they are connected. ... There would → There'd → "There'd have been more people here if the party had been on the weekend." That had → That'd → "That'd better be the last time she calls me." ... Signup to our newsletter "English in ...
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Grammarplainandsimple
grammarplainandsimple.com › home › parts of speech › 839. contractions with would
839. Contractions with Would - Grammar, Plain and Simple
April 18, 2024 - Certain pronouns can be combined with the verb would. I would = I'dyou would = you'dwe would = we'dthey would = they'd I would help you if I could.I'd help you if I could. We would make a good team.We'd make a good team. Use the verb would to make contractions. ▶Now you try it.
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Enchanted Learning
enchantedlearning.com › grammar › contractions › index.shtml
Contractions - Enchanted Learning
March 9, 2006 - In a contraction, an apostrophe takes the place of the missing letter or letters. Some contractions are: I’m (I am), can’t (cannot), how’s (how is), and Ma’am (Madam). For example, “don’t” is a contraction that is short for “do not”; the apostrophe in “don’t” takes the ...
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Gymglish
gymglish.com › homepage › online english lessons › grammar rules: learn and improve - gymglish › contractions: 'would' vs 'had'
Contractions: 'would' vs 'had': How and When to Use - Gymglish
The auxiliary verbs would and had are both contracted to 'd. How can they be distinguished? • Would is always followed by a verb in the infinitive without the to: I'd like some sugar please. I would like some sugar please. I'd be glad to meet you. I would be glad to meet you.
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Study.com
study.com › courses › english courses › study.com act study guide and test prep
Contractions in Grammar | Overview, Definition & Examples - Lesson | Study.com
April 30, 2016 - The contraction for "she had" is "she'd," as in "They said she'd already gone." The contraction for "he had" is "he'd" as in "He did not know what he'd done." The contraction for "I would" is "I'd," as in "I'd like to have lunch now."
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GCFGlobal
edu.gcfglobal.org › en › grammar › contractions › 1
Grammar: Contractions
Remember how we said contractions are made of two words that have been shortened? The apostrophe replaces any letters that are in the original words, but that aren't in the contraction. For instance, the contraction couldn't means could not. As you can see, the o in not isn't in the word couldn't. The apostrophe goes in its place, right between the n and t. Let's look at another example...