题目内容
6．---Tommy，do you know if Frank______to the trip with us this Sunday if it_____？Sorry，I have no idea．（ ）
| A． | will go； is fine | B． | goes； is fine | ||
| C． | will go； is going to be fine | D． | goes； will be fine |
分析 ---托米，你知道如果天气好弗兰克这周日是否会和我们一起去旅行吗？
---抱歉，我不知道．
解答 答案：A．第一个if引导的是宾语从句，主句是一般现在时，从句时态不受限制，结合句意如果天气好弗兰克这周日是否会和我们一起去旅行吗，应用一般将来时，will+动词原形；第二个if引导的是条件状语从句，遵循主将从现的规则，从句主语it，故is，故答案是A．
点评 if引导一条件状语从句，译为"如果"．He will come if you invite him．如果你请他，他会来的．
二是宾语从句，译为"是否"．I wonder if she is ill．不知她是否病了．
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