举例说明
1.When he knows the result(从句）, he will be happy（主句）
2.when i arrived (从句）, i found the door open.（主句）
3.when he came in (从句）, i was watching TV (主句）
4.I won't leave (主句）until he finishes the work(从句）
5.As soon as he arrived(从句）， he began to work(主句）
6.while he was in London(从句）， he made a lot of friends.
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