1. I think she is there.

　　誤：I think she isn’t there.

　　正：I don’t think she is there.

　　析：英語中think, believe, expect, suppose等表示信念和揣測的動詞，后接that從句時，習慣上將從句中的否定形式轉移到主句上，即否定主句謂語，不否定從句謂語。

　　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，否定句中用either替換。
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