是状语从句还是宾语从句请看下面一道题：I don’t know if he _________ or not tomorrow.A. come B. comes C. will come D. is coming【分析】此题容易误选B。认为 if 引导的是条件状语从句，从句谓语要用一般现在时表示将来意义。其实，此题应选C，句中if引导的不是条件状语从句(即if≠如果)，而是宾语从句(即if＝是否)，句意为“我不知道明天他是否会来。”请看以下类似试题：(1) I don't know if she _________, but if she _________ I will let you know.A. comes, comes B. will come, will comeC. 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。(2) “When _________ he come?” “I don’t know, but when he _________, I’ll tell you.”A. does, comes B. will, will comeC. does, will come D. will, comes答案选 D，第一个 when 疑问副词，用于引出一个特殊疑问句；第二个 when是从属连词，用于引导时间状语从句。(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。 说明:引用此文请注明出处,并请保留该文章链接地址,谢谢~~