while引导的从句时态,主句时态 ,when引导的从句时态,主句时态

可以参考《结束蹦单词时代：外教教你用连词》,中国书籍出版社,第165-166页和第171-172页：
1.When he sleeps,he often sucks his thumb.
2.I always drink coffee when I work.
3.When he gave me a present,I thanked him.
4.She cuddled her teddy bear when she went to sleep.
5.When I am studying,my dog sits under the desk.
6.I usually set the table when my mum is cooking the dinner.
7.When I was walking along,I came across a friend of mine.
8.My friend waved to me when I was cycling past.
9.When I have finished my studies,I am going to work abroad.
10.I shall give you a call when you have finished work.
11.When they had finished eating their meal,the guests moved to the lounge for some coffee.
12.The cat looked terrified when I had found her.
13.When driving,wear your seat belt.
14.I saw a squirrel in the park when going for a jog.
when 引导的从句可以用一般现在时（主句用一般现在时）、一般过去时（主句用一般过去时）、现在进行时（主句用一般现在时）、过去进行时（主句用一般过去时）、现在完成时（主句用将来时）,或过去完成时（主句用一般过去时）.when 后面还可以去掉“主语 + be”,直接用动名词（主句用一般现在时或一般过去时）.
1.While I do the housework,you clean the car.
2.You hold up the picture while I nail it into the wall.
3.While he watched TV,I cooked the dinner.
4.I tidied up the house while he slept on the couch.
5.While I was walking to school,it started to rain.
6.I had some coffee while I was reading.
7.While she was reading,I was playing the piano.
8.I was washing the plates while he was clearing the table.
9.While munching your food,close your mouth.
10.My stomach grumbled while waiting for the pizza to arrive.
while 引导的从句可以用一般现在时（主句用一般现在时）、一般过去时（主句用一般过去时）,或过去进行时（主句用一般过去时或过去进行时）.while 后面还可以去掉“主语 + be”,直接用动名词（主句用一般现在时或一般过去时）.