"My passport will expire in three months."

This sentence is from my textbook. I'm wondering why it's not written as "My passport *expires* in three months."

Here is an example from LDOCE Online:

My driving licence expires in March.

In this case, it goes with the present tense, which is grammatically correct to me, because we're taught that when it comes to a sure thing to happen in the future, we should use the present tense instead of the future tense. Why is this sentence in the future tense? Is it correct? I have a feeling that it may have something to do with "in three months," right?  Thank you.



Original Post

Hi, Barry,

When talking about events that are part of a timetable, we can use either the simple present or 'will + inf.'. See Michael Swan, page 190:

"We can sometimes use the simple present to talk about the future. This is
common when we are talking about events which are part of a timetable, a
regular schedule or something similar.
The summer term starts on April 10th.
What time does the bus arrive in Seattle?
My plane leaves at three o'clock.
Are you on duty next weekend?
The sun rises at 6.13 tomorrow.
'Will' is also usually possible in these cases."

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