1. I think she is there.
誤：I think she isn’t there.
正：I don’t think she is there.
析：英語(yǔ)中think, believe, expect, suppose等表示信念和揣測(cè)的動(dòng)詞，后接that從句時(shí)，習(xí)慣上將從句中的否定形式轉(zhuǎn)移到主句上，即否定主句謂語(yǔ)，不否定從句謂語(yǔ)。
2. He can sing this song and that one.
誤：He cannot sing this song and that one.
正;He cannot sing this song or that one.
析：肯定句中的連詞and在否定句中一般要改為or。
3. Tom went to school too.
誤：Tom didn’t go to school too.
正：Tom didn’t go to school either.
析：too和also用于肯定句中時(shí)，否定句中用either替換。
4. He has had supper already.
誤：He hasn’t had supper already.
正：He hasn’t had supper yet.
析：隨著對(duì)謂語(yǔ)動(dòng)詞的否定，某些副詞也要作相應(yīng)的變動(dòng)。
5. He had a good rest just now.
誤：He hadn’t a good rest just now.
正：He didn’t have a good rest just now.
析：have在表示開(kāi)會(huì)、吃飯、休息、進(jìn)行體育鍛煉等詞組中是行為動(dòng)詞，否定句用助動(dòng)詞來(lái)完成。
6. Let’s do it.
誤：Let’s don’t do it.
正：Don’t let’s do it.或Let’s not do it.
析：let后接的是不帶to的不定式，變?yōu)榉穸ㄊ?，直接在句首前加Don’t或在不定式前加not。
7. He always gets there on time.
誤：He doesn’t always get there on time.
正：He never gets there on time.
析：He doesn’t always get there on time意為“他并非老是準(zhǔn)時(shí)到那兒”，是部分否定，習(xí)慣上把句中的副詞改為相應(yīng)的表示否定的副詞即可。如：
It often rains here. It seldom rains here.
8. Be here early tomorrow.
誤：Be not here early tomorrow.
正：Don’t be here early tomorrow.
析：祈使句的否定，一般在謂語(yǔ)動(dòng)詞前加do not的縮寫(xiě)don’t。
9. You had better come.
誤：You didn’t have better come.
正：You had better not come.
析：had better相當(dāng)于一情態(tài)動(dòng)詞，不可分割，因此not應(yīng)放在其后。would rather也是如此。
10. Both Tom and Xiao Ping went to school.
誤：Both Tom and Xiao Ping didn’t go to school.
正：Neither Tom nor Xiao Ping went to school.
析：一個(gè)句子中如果有不定代詞both，all, every改為否定式時(shí)，要把這些不定代詞改為相應(yīng)的表示否定的代詞。
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