时间介词有in , on，at， after， since，during,by,before,after,until等，前三个介词用法有个口诀： at午夜、点与分，上午、下午、晚用in。
介词 in + 一段时间用于一般将来时。如：We’ll go to school in two weeks.
介词after + 一段时间用于一般过去时。如：My mother came home after half an hour. 介词after + 时间点常用于一般将来时。如：We’ll go out for a walk after supper.
介词for 表示一段时间如：I have been living here for 10 years.
介词since 表示从过去某一时间以来如：I have been living here since 2000.
介词before表示“在?之前”如：He won’t come back before five .
介词by表示“到?时为止，不迟于?”如：The work must be finished by Friday.
当所指的时间起止分明时用介词during如：He swims every day during the summer. 如果一段时间不明确则用介词for如：I haven’t seen her for years.
till和until用在肯定句中，均可表示“直到?为止”，如：I will wait till(until)seven o'clock.
如：Tom didn't come back till(until)midnight.
till多用于普通文体，而 until则用于多种文体，并且在句子开头时，用until而不用till如：Until he comes back，nothing can be done.
注意：在last, next, this, that, some, every 等词之前一律不用介词。
1. She usually gets to school _______ 7:30 in the morning.
2. Can you come here ______ the morning of April 5?
3. Some of my classmates were born ______ May, 1982.
4. It is often too hot _____ summer in China.
5. The girl left her home _______ a cold winter evening.
6. He has lived here ______ 1980.
7. We have worked in this city ______ about 5 years.
8. My father usually goes to bed at ten ______ night. 9. What do the students do ______ Monday afternoon? 10. I must go now. My parents are waiting _______ me at the bus stop. 11. My pen pal lives _______ Sydney, Australia. 12. Lucy is a good student. She often helps her classmates ______ their lessons. 13. The old woman often goes out ______ a walk after supper. 14. Most ______ us are doing very well _______ maths.
15. Don’t forget to say “Thank you” when someone opens the door ________ you. 16. Hawaii is famous _________ its beautiful beaches.
17. I won’t believe you until I see it ________my own eyes. 18. I have borrowed some books _______ our school library. 19. How far is it ______ Sydney _______ Beijing? 20. Is there anything wrong _______ your computer? 21. The train is passing __________ a tunnel.
22. It’s a big house ________ an interesting swimming pool. 23. There is a map and some pictures ________ the wall in our classroom. 24. Look! Lily is lying ________ the beach and enjoying the sun.
25. Don’t treat him ________ a child.