连接词 conj.
1.
当...时
John got engaged to her when travelling last winter.
去年冬天旅行时,约翰与她订了婚.
Don't get excited when you talk.
你说话时别激动.
2.
既然,考虑到
How can he get the promotion when his boss dislikes him?
既然上司不喜欢他,那他怎么会获得提升呢?
3.
虽然,然而
I had only fifteen dollars on me when the book I wanted cost twenty.
我身上只带了十五元钱,可是我想买的那本书定价二十元.
4.在那时,然后
while的用法
连接词 conj.
1.
当...的时候,和...同时
She listened closely while he read the letter.
他读信时,她听得很仔细.
I'll take care of your children while you are away.
你不在时我会照顾你的孩子的.
We must strike while the iron is hot.
我们必须趁热打铁.
2.
而,然而
I like tea while she likes coffee.
我喜欢喝茶,而她喜欢喝咖啡.
3.
虽然,尽管
While I like the color of the hat, I do not like its shape.
虽然我喜欢这顶帽子的颜色,但我不喜欢它的形状.
4.只要
总而言之,when后可接句子,也可以加动名词
while后也接句子和动名词
只是两者表达的意思略有不同