They answers the question "when".
Exercises - Prepositions of time
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1) My sister watches TV at in the evening.
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2) They visit their parents in at weekend.
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3) She eats ice-cream in at summer.
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4) I start school in at September.
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5) I was born on in 1993.
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6) His birthday is on in August 15th.
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7) I start the lesson in at 9 o'clock.
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8) My father is on holiday in England at in the moment.
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9) We meet on in Tuesday.
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10) You wake up in at 6 o'clock.