题目内容
9．I don't know if he ______．If he _____，please let me know．（ ）| A． | comes； will come | B． | will come； comes | ||
| C． | comes； comes |
分析 我不知道他是否要来．如果他来，请让我知道．
解答 答案：B； 第一个if表示是否的含义，引导宾语从句，此时根据语境理解，我不知道他是否将要过来，用一般将来时，故填will come； 第二个if表示如果的含义，引导条件状语从句，遵循"主将从现"的原则，或者主句为祈使句，从句使用一般现在时，he 为第三人称单数，故填comes，所以选B．
点评 考查if表示if表示是否的含义，引导宾语从句；以及if表示如果的含义，引导条件状语从句时的语法规则．
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