
at six o’clock 在6点;
at noon,在中午(在12点);
on Saturday, 星期天
on August 3,在8月3日
on Friday afternoon ,在星期五下午;
On the morining of May 1, 在5月1日的早上;

in the morning, 在早上;
in this week, 在这星期;
in December, 在12月;
in summer, 在夏天;
in 2008, 在2008年;

since是指延续到说话时刻的动作或情况开始于何时,是站在动作中止的时间点往过去追溯计算;
from只表示某事的起点,要表示起止需用from…to〔until〕…结构;
Our whole family work from morning till night.
我们全家人从早到晚工作。
I have been busy since yesterday.
从昨天开始我一直很忙。
I need your report by Friday.
周5之前把报告交给我。
I need your report until Friday.
你的报告我要用到星期5。
DD lived in Shenzhen untill 2021;
DD 在深圳住到了2021年;
Wash your hands before eating. // before 当介词;
Wash your hands before you eat. // before 当连词;吃东西前要洗手。
Let’s play basketball after school.
放学后打篮球吧。
We have lived in SZ for seven years.
我在深圳已经生活了7年。
I‘ll take him to the place druing his stay.
我会在他停留的期间带他去那个地方玩。
Curry studied math through the whole night.
Curry 整个晚上都在学数学。
You need study very hard then you can learn English well.
你要努力学习才能把英语学好。
I will come back home in ten days.
I will be back in ten days.
我会在10天之后回家。
I will come back home within ten days.
我会在10天之内回家。