lucas21c If it's two thirty, you can go home. This can work in the right context. A: Can I go home now?
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lucas21cIf it's two thirty, you can go home.This can work in the right context.
lucas21cIf it becomes two thirty, you can go home.No, that's not natural because it's a matter of "when" not "if"!
lucas21cYou can go home when it is two thirtyIt's not wrong, but it's a less idiomatic way of saying You can go home at two-thirty. The meaning is the same.