Prepositions in expression of time: in, at, on, ago.
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Prepositions in expression of time: in, at, on, ago.
Time phrases are words that show the verb tense we need to use.
Note: We say at night when we are talking about all of the night:
Example: He sleeps during the day and works at night.
But we say in the night when we are talking about a short time during the night:
Example: He woke up twice in the night.