根據(jù)語法的慣例，think, suppose, believe, imagine, guess 等后的賓語從句如果是否定句，要把否定轉(zhuǎn)移到主句的think等動詞上，這叫做“否定前移”或“否定前置”。
如：I think you can not go there by bus. (誤)
I don’t think you can go there by bus.（正）
我認(rèn)為你不能乘坐公共汽車去那兒。
在冀教版九年級課本第25課課文中，有這么一句話：“I thought you didn’t have any money.”該句是一個賓語從句，從句中的否定沒有轉(zhuǎn)移到主句中。這是為什么呢？是不是還有其他情況下否定不前移呢？筆者經(jīng)過翻閱若干本英語參考書及工具書，總結(jié)出以下情況下think 等詞后的賓語從句的否定不能轉(zhuǎn)移到主句think動詞上。
① think 是完成時態(tài)或完成進(jìn)行時態(tài)時；
如：I have been thinking that we should not take his advice.
我一直認(rèn)為我們不應(yīng)該聽他的話。
② think 是一般過去時或過去進(jìn)行時態(tài)時；
如：We thought that this book was not worth reading.
我們認(rèn)為這本書值得一讀。
③ think 前有副詞修飾的時候；
如：I almost think you are not my son’s teacher.
我差點(diǎn)認(rèn)為你不是我兒子的老師。
④ think 前有do, did 等詞強(qiáng)調(diào)時；
如：I do think that she is not pretty at all.
我確實(shí)認(rèn)為她不漂亮。
⑤ think 用于一般疑問句或特殊疑問句中；
如：Do you think he will not join the Party?
你認(rèn)為他不會入黨嗎？
Why do think we can’t beat you?
你們怎么認(rèn)為我們打不贏你們呢？
⑥ 當(dāng)think后的賓語從句中含有no, never, nothing, nobody等否定詞時；
如：I think she may have nothing to do today.
我認(rèn)為她今天沒事干。
⑦ 當(dāng) think 用作插入語時；
如：Your sister ,I think, is not a friendly gay.
我認(rèn)為你妹妹不太友好。
⑧ 當(dāng)think后的賓語從句中含有not at all, not a little, not enough, can’t help doing 等固定詞組時；如：I think you can’t help laughing when you hear the joke.
我認(rèn)為你聽到這個笑話時會忍不住笑的。
⑨ 當(dāng)think和另一個動詞構(gòu)成并列謂語時；
如：I think and hope you won’t feel sad even if you lose the match.
⑩ 當(dāng)think用作虛擬語氣的謂語had thought, 表示“本來認(rèn)為……”時； 如：I had thought that he hadn’t come here.
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