I stumbled across this sentence while reading a book:

It's not due in tomorrow.

it refers to a piece of homework.

After looking up the word "due" in several dictionaries, I suppose "due" means expected and "due in" is not a fixed phrase.

I wonder why they don't just say "It's not due tomorrow.". If a preposition is compulsory, why isn't it "on" because "tomorrow" is a day?

1 Answer 1


You're right, the preposition is usually omitted, but it's not wrong; here is a similar example from Lexico:

Karen's train was due in soon after 2, so I made my way back to the station, having to squeeze through a thick colonnade of cyclists in order to do so.

It doesn't change the meaning, so "It's not due tomorrow." means the same and is much more common.

  • 1
    The homework is not due [to be handed] in. The train is due [to come] in [to the station]. Commented May 21, 2020 at 10:08
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    I agree with @KateBunting that there is something elided, but I've always considered it differently: (1) The assignment is not due in [the classroom] until tomorrow. (2) The train is not due in [the station] until tomorrow. Using in, to me, always implies an elided prepositional object—not an elided verbal phrase. Commented May 21, 2020 at 18:54

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