you'll
- 1Short for 'you will'; used to state what is going to happen or what someone is going to do.
You'll need a ticket to enter the museum.
Once the rain stops, you'll be able to see the mountains clearly.
Note
One spelling hides two auxiliaries: you'll can stand for you will or for you shall, and the contracted form keeps neither visible. In everyday speech the contraction is the ordinary choice. Writing out the full you will tends to add emphasis or a more formal tone, as in a warning meant to be heard. When the meaning is simple prediction (you'll need a ticket), will is the word underneath.
- 2Short for 'you shall'; used to express a promise, command, or strong assurance about what is to come.
You'll want for nothing as long as I am here to provide.
You'll report to the captain at dawn, without exception.
Note
Here the speaker's will matters more than the future. Second-person shall carries a promise or an order, such as a guardian's assurance or an officer's instruction, where the plain "you will" meaning only predicts. To tell them apart, expand the contraction and listen. If you shall fits and you will sounds too neutral, this is the sense. The same tone survives in you'll do as you're told.
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Origin
A contraction of "you will" or "you shall."