当你的孩子分不清,在早上的时候要用 in the morning, on the morning, at the morning,可以这么跟他说。

如果要具体说哪一天,那就必须得用 on, on Monday morning, on Tuesday afternoon,或者是 on Wednesday evening.

那如果不说具体哪一天,那必须得用 in, in the morning, in the afternoon, in the evening.

但是记得,夜里必须得说 at, at night.