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動(dòng)詞時(shí)態(tài)典型易錯(cuò)題分析-04

【典型考題】He is very busy. I don’t know if he _____ or not tomorrow.

A. come                                                   B. comes

C. will come                                             D. is coming

【易錯(cuò)陷阱】此題容易誤選B。認(rèn)為 if 引導(dǎo)的是條件狀語從句，從句謂語要用一般現(xiàn)在時(shí)表示將來意義。

【思路分析】其實(shí)，此題答案應(yīng)選C，句中if引導(dǎo)的不是條件狀語從句(即if≠如果)，而是賓語從句(即if＝是否)，句意為“他很忙，我不知道明天他是否會(huì)來。”請(qǐng)看以下類似試題：

(1) I don’t 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

答案選 D，第一個(gè) if 引導(dǎo)的是賓語從句，第二個(gè) if 引導(dǎo)的是條件狀語從句。

(2) “When _____ he come?” “I don’t know, but when he _____, I’ll tell you.”

A. does, comes         B. will, will come

C. does, will come      D. will, comes

答案選 D，第一個(gè) when 疑問副詞，用于引出一個(gè)特殊疑問句；第二個(gè) when是從屬連詞，用于引導(dǎo)時(shí)間狀語從句。

(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

答案選 D，第一個(gè) when 引導(dǎo)的是主語從句，第二個(gè) when引導(dǎo)的是時(shí)間狀語從句。