ELI5: What's the rule for using "I'll" in English? Because sometimes it makes sense but sometimes it sounds awkward, for example, "Okay, I'll."
contractions - is "I'll" correct as a short answer? - English Language Learners Stack Exchange
How to properly use i'd, i'll and i've
word meaning - What is the difference between I'll and I will? - English Language Learners Stack Exchange
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Only unstressed auxiliaries can be contracted.
But when an auxiliary is used by itself to 'code' (stand for) the longer verb phrase it introduces, it is always stressed.
Will you be at the party this Friday?
right! I willbe at the party.
Consequently, an auxiliary used this way cannot be contracted.
Will you be at the party this Friday?
wrong! I'llbe at the party.
** ADDED **
anotherdave reminds us of a couple of contexts in which this principle seems not to be followed:
With contractions in which not becomes n't—"I shan't!", "I won't", "I haven't!", and so forth. Here, however, the verb is still emphasized; and it is really only not which is contracted, losing its vowel and its syllabic status; the last consonant of the auxiliary assimilates to the n't, which is really a separate phenomenon.
With contractions followed by not—"I'll not", "I've not", and so forth. In these cases the auxiliary does not 'code' the entire remainder of the following verb phrase: it remains unstressed, just as it is in the unreduced form, and the emphasis falls on not.
This is as wrong as wrong can be! He should be saying I will. After all, you don't say I'm in response to the question Are you a human?. You say I am. You need that expanded form to give the emphasis to the verb. And it is indeed very difficult to say on its own because you just never hear people say that. Long story short, what your friend does is wrong.
Example:
— Hey, will you give me a wakeup call tomorrow's morning? Otherwise, I'll be late again.
— No worries. I will.
Hello! This subject (i think i just used that word wrong, please correct me if i did) has been confusing me a bit for a while, and i could'nt find any information about this on internet so if someone can explain this to me it would be really helpful.
The difference between "I will" and "I'll" is their formalities. Contractions are generally less formal than the same two words written out.
You can use contractions in informal speech and messages, but not in formal, professional writing. Many style guides for journalism and academic writing discourage the use of contractions outside of quotes.
Further reading: http://www.everythingenglishblog.com/?p=558
I'll is a contraction of I will. These types of "apostrophe words" are called contractions (though be aware that there are other reasons to use apostrophes besides forming contractions). The apostrophe indicates that one or more letters were removed, thereby shortening, or contracting, the word. In this example, I (wi)ll = I'll
As kb90 mentions, contractions are generally considered less formal, at least in writing. However, they are extremely common in speech—native English speakers use them all the time without thinking about it. In fact, they are so common that it often sounds strange, forced, or excessively formal to say "I will" in a casual conversation.
I agree with kb90'suggestions for use in writing; I would only add that "I'll" is frequently used in speech. While you will certainly be understood if you say "I will", your speech might sound a little more natural if you pay attention to and imitate the way that native speakers use contractions like "I'll".