Exercise interchange basic 01

At / On / in ( time ) Compare at, on and in:
* They arrived at 5o´clock.
* They arrived on Friday.
* They arrived in October. / They arrived in 1968.
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We use:
at for the time of day:
at 5 o´clock at 11:45 at midninght at lunchtime at sunset stc.
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on for days and dates:
onm Friday / on Fridays on 12 March 1999 on Christmas Day on my birthday
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in for longer periods ( for exemple, months/ years/ seasons ) :
in October in 1968 in the 118th century in the past
in (the) winter in the 1970s in the Middle Ages in ( the ) future
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We use at in these expressions:
at night I don´t like going out at night.
at the weekend / at weekends Will you be here at thet weekend?
at Christmas / at Easter Do you give each other presents at Christmas?
at the moment / at present Mr Benn is busy at the moment / at present.
at the same time Liz and I arrived at the same time.
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We say:
in the morning(s) in the afternoon(s) in the evening(s)
*I will see you in the morning. Do you work in the evenings?

but:
on Friday morning(s) on Sunday afternoon(s) on Monday evening(s) etc.
I`ll be at home on Friday morning. Do you usually go out on Saturday evenings?
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