6.　　　 as soon as

I will call you as soon as I arrive in Shanghai.

5.　　　 by the time

By the time I got there, the bus had already left.

4.　　　 until/not…until

He is leaving the first week in juve and staying until September.

Although tea wasn’t brought to the Western world until 1610…

3.　　　 before

　 Before I started high school, I used to spend a lot of time playing games with my friends…

2.　　　 while

While the UFO landed, the boy was walking down the street.

1.　　　 when

　 When I was young, I used to have so much time…

2. Although

I’m having a great time in Hong Kong, although I have to be honest and say that I prefer Shanghai.

Although tea wasn’t brought to the Western world until 1610…

表示时间关系

1. though

It does have a few good features, though.

2.　　　 unless

You will fail the test unless you work harder.

表示让步关系

1.　　　 if

　　 If you go to the party, you will have a great time.