(1)表示選擇關系的連詞，連接的雙方只取其一。常用連詞有or, either...or, otherwise

例如：

1)You can go to Beijing either today or tomorrow

2)You must get up early or you won't catch the early bus.

(2)表示轉折關系，連接的雙方構成對比，意義上有轉折。常用連詞有but, however, while, only

例如：

1) His brother is fond of football while he likes basketball.

2) You can watch TV, but you must finish your homework first.

(3)表示聯合關系，聯合的雙方是對等的，意義上趨向一致。常用連詞有：and, both...and, neither...nor, not only...but also, as well as, together with

例如：

1) To study English well, we need both diligence and careful.

2) That horse is not only the youngest among the five, but also runs the fastest.

(4)表示因果關系，連接的雙方，互為因果，或者前因后果，或者前果后因。常用的連詞有：for, so, therefore

例如：

1) It must have rained, for the ground is wet.

2) You are in the right, therefore they should support you.

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