中考網整理了關于2021中考英語連詞知識點之表示選擇關系的連詞，希望對同學們有所幫助，僅供參考。

　　1)or意思為"或則"。

　　Which do you prefer,tea,coffee,or juice?

　　2)either…or意思為"或者……或者……"。注意謂語動詞采用就近原則。

　　Either you or I am right.

　　3)or else/otherwise否則

　　Be silent,or else you will be kicked out.

　　I am tired,otherwise,I would play.

　　第三類表示轉折或對比關系的連詞

　　1)but但是He is rich but unhappy.

　　while然而，表示對比意味Some people love cats,while others hate them.

　　yet然而She said she would be late,yet she arrived on time.

　　however然而，可是，不過She does not like him,however,I like him.

　　2)not…but…意思為"不是……而是……"

　　not和but后面的用詞要遵循一致原則。

　　They were not the bones of an animal,but(the bones)of a human being.

　　第四類表因果關系的連詞

　　1)for因為，做并列連詞使用時，是在對先行的句子補述原因或者理由，只可以連接句子與句子，通常不置于句首。

　　He is absent today,for he is ill.

　　2)so,therefore因此

　　He hurt his leg,so he couldn't play in the game.

　　I think,therefore I am

　　3)then那么，因而

　　Hide behind the wall,then they won’t see you.

　　注意：

　　a.兩個并列連詞不能連用，但therefore,then,yet.可以和并列連詞連用。

　　You can watch TV,and or you can go to bed.

　　He hurt his leg,and so/and therefore he couldn't play in the game.

　　b.although…yet…，但although不與but連用。

　　(錯)Although he was weak,but he tried his best to do the work..

　　(對)Although he was weak,yet he tried his best to do the work.

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