Explanations - 3 - Basics. Prepositions of Time: At, On, and In

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The detective is checking the suspects' statements. Select ALL the sentences that use time prepositions correctly.

I was sleeping at midnight.

The robbery happened at 9:30 PM.

I was at work in Monday.

I woke up at the morning.

The correct answers are I was sleeping at midnight. and The robbery happened at 9:30 PM.

We use the preposition at for specific clock times (9:30 PM) and specific points like at midnight.

"I was at work in Monday" is incorrect because days of the week require on (on Monday).

"I woke up at the morning" is incorrect because parts of the day require in (in the morning).