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Subject : English
Category : Preposition of Time
Level : JHS
Keywords : in, on, at

we use IN for
– years (in 2018)
– months (in December)
– seasons (in spring, in the summer)
– centuries (in the 20th century)
– long periods (in the Renaissance age)

We use ON for :
– days (on Monday, on Tuesdays, On Christmas Day)
– dates (on 6 May)

We use AT for precise time (at 1 o'clock, at sunrise, at the moment)

Common expressions with IN, ON, AT :
– in the morning(s), in the afternoon(s), in the evening(s)
– on Monday morning, on Tuesday afternoon, on Friday evening
– at night, at noon, at midnight, at the weekend, at the same time, at present

CORRECTIONS :
21. in
25. in
27. in
28. in, in
30. on

1√
2.harusnya In the evening
kayanyabyng lain dh bener