Do you get confused between the words”if” and “when”? If so, check this post to know more about them.

According to Cambridge Dictionary, we use if to introduce a possible or unreal situation or condition. We use when to refer to the time of a future situation or condition that we are certain.
You can only go in if you’ve got your ticket.
When I’m older, I’d love to be a dancer.
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If Giles comes back to the office, can you tell him I’ve gone home. | The speaker does not know whether Giles is coming back to the office. It is possible, but not definite. |
When Giles comes back to the office, can you tell him I’ve gone home. | The speaker is certain that Giles is coming back to the office. |
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