The MBA Center Grammar Review for the TOEFL - part 8 doc

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Consider these exceptions:

We were on the beach.

I will meet you on the corner of 5th in ten minutes.

He was in the apartment on Main Street.

Time

At...referring to a specific time

...at 10 o’clock

....at sunset

....at midnight

On...referring to a particular day

...on Monday

...on July 23rd

...on the first day of the month

In....referring to a general period of time

...in the Middle Ages

...in 1998

...in ten minutes

Consider this example:

Classes will begin at 6:30 on Monday in September.

And consider these exceptions:

at night

in the evenings

at present

over the weekend

at Christmas

Other time prepositions

Since...refers to a time when the action began.

We have lived here since 1996.

I have studied since I was a child.

(Notice that we use the present perfect tense: the action began in the past and continues

through the moment of speaking.)

For...refers to a period of time

We have lived here for 3 years.

I studied for 20 years.

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