A. IN
In digunakan untuk seseatu yang general/umum dan lebih luas cakupannya. Seperti tahun, bulan, kota, pagi, siang dan malam.
Example: a). Please be on time in the future= in + the future
b). I Usually watch TV in the evening= in + the evening
c). I was born in October= in+ a month
d). I was born in 1975 = in + a year
e). The Wheater is hot in the summer = in + a season
yang bisa digunakkan untuk in adalah: in the past, in the future, in the present, in the morning, inthe afternoon, in the evening, in+ a month/ a year/ a century/a season
B. On
On digunakan untuk sesuatu yang lebih spesifik daripada in. Misalnya hari, tanggal, kecamatan/ desa.
Example a). I was born on October 31, 1975
b). I went to a movie on Thursday
c). I have class on Thursday morning
C. At
At digunakan untuk sesuatu yang sangat rinci, misal at noon, at night, at midnight, at present at the moment
Example : a). We sleep at night. I was asleep at midnight
b). I fell asleep at 9.30