review book 4 unit 7&8
work on book 5 unit 1&2
preposition of time at/in/on
at -> 时间点 i.e. at 7 o’clock
in -> 时间段 i.e. in the morning
on -> 某一天 i.e. on Monday
Comments are closed.
Username
Password
Remember Me
Lost your password?
Comments are closed.