NOUNS AND PRONOUNS - Prepositions of time

  IN
(a) Please be on time in the future
(b) I usually watch TV in the evening
(c) I was born in October
(d) I was born in 1985
(e) I was born in the twentieth century.
(f) The weather is hot in (the) summer.
In + the past, the present, the future.
In + the morning, the afternoon, the evening
In + (a month, a year, a century, a season)
ON
(g) I was born on October 31, 1985
(h) I went to a movie on Thursday
(i) I have class on Thursday morning(s).
On + date
On + a weekday
On + a weekday morning(s), afternoon(s), evening(s)
AT
(j) We sleep at night. I was asleep at midnight.
(k) I fell asleep at 9:30 (nine-thirty)
(l) He’s busy at present. Please call again.
At + noon, night, midnight
At + “clock time”
At + present, the moment, the present time.