Will

I will leave later.
You will leave later.
He / she will leave later.
We will leave later.
They will leave later.

Will 在日常口语常缩略为 'll：

I'll leave later.
He'll leave later.

I'll give you a call at about 6 o'clock.
我6点钟左右给你打电话。

Will 的否定形式是 won't：

I won't leave later.
He won't leave later.

在正式的语境中或想强调的时候，使用 will not：

I will not leave later. 

疑问句就把 will 放到主语前面：
Will you leave later?
你晚会儿离开吗？

Will you be home earlier tomorrow?
明天你会早点回家吗？