1）引導(dǎo)主語(yǔ)從句時(shí)。例如：

　　Whether he will come to the party is unknown.

　　2）引導(dǎo)表語(yǔ)從句時(shí)。例如：

　　The question is whether I can pass the exam.

　　3）在不定式前。例如：

　　I haven’t made up my mind whether to go there or not.

　　（4）so…that, such…that

　　1）so…that中的so是個(gè)副詞，其后只能跟形容詞或副詞，而such…that中的such是個(gè)形容詞，后接名詞或名詞短語(yǔ)。例如：

　　I’m so tired that I can’t walk any farther.

　　It was such a warm day that he went swimming.

　　2）如果在名詞之前有many, much, little, few時(shí)，用so,不用such。例如：

　　He has so little education that he is unable to get a job.

　　I have had so many falls that I am black and blue all over.

　　（5）either…or…， neither…nor, not only…but also…

　　這三個(gè)連詞詞組都可連接兩個(gè)并列成分。當(dāng)它們連接兩個(gè)并列主語(yǔ)時(shí)，

　　謂語(yǔ)動(dòng)詞要隨相鄰的主語(yǔ)變化。例如：

　　Either you or he is wrong.

　　Neither he nor his children like fish.

　　Not only the teacher but also the students want to buy the book.

　　（6）although, but

　　這兩個(gè)連詞不能用在同一個(gè)句子中。例如：我們不能說(shuō)“Although he is

　　over sixty, but he works as hard as others.”這個(gè)句子應(yīng)改為：Although he is over sixty, he works as hard as others.或He is over sixty, but he works as hard as others.

　　（7）because, so

　　這兩個(gè)連詞同樣不能用在同一個(gè)句子中。例如：我們不能說(shuō)“Because John

　　was ill, so I took him to the doctor.” 這個(gè)句子應(yīng)改為Because John was ill, I took him to the doctor.或John was ill, so I took him to the doctor.

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