一、词序问题
名词性从句总是用陈述句词序,则不能使用疑问句词序,尤其是当名词性从句由疑问词引导时,不能受疑问句的影响而误用疑问句词序:
误:I didnt know where did he live.
正:I didnt know where he lived. 我不知道他住哪儿。
误:Who will he marry remains unknown.
正:Who he will marry remains unknown. 他同谁结婚还不知道。
二、时态问题
由于由when引导的时间状语从句和以if引导的条件状语从句要用现在时表示将来意义,而不能直接使用将来时态,所以许多同学容易受此影响在when和if引导名词性从句时也用现在时表示将来意义。请看几题:
(1) I dont know if he ________ or not tomorrow.
A. come B. comes
C. will come D. is coming
此题答案选C,句中if引导的不是条件状语从句(if如果),而是宾语从句(if=是否),句意为我不知道明天他是否会来。
(2) I dont know if she ________, but if she ________ I will let you know.
A. comes, comes B. will come, will come
C. comes, will come D. will come, comes
答案选 D,第一个 if 引导的是宾语从句,第二个 if 引导的是条件状语从句。
(3) When he _____ is not known yet. But when he ____, he will be warmly welcomed.
A. comes, comes B. will come, will come
C. comes, will come D. will come, comes
答案选 D,第一个 when 引导的是主语从句,第二个 when引导的是时间状语从句。
另外,当主句为过去时态时,宾语从句通常要用过去的某种时态与之呼应(表客观真理时除外):
The teacher told us that he knew everything. 老师告诉我们他知道一切。
The teacher told us that light travels faster than sound. 老师告诉我们光比声音传播得快。
下一篇: 英语语法名词性从句知识:四组名词性从句
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