题目内容
9.-Hi,do you know if Tom ________ to my party next week?-I think he will come if he _______ free.( )
| A. | will come; will be | B. | will come; is | ||
| C. | come; is | D. | come; will be |
分析 ---你知道下周汤姆是否会参加我的聚会吗?
---我认为如果他有空他会去的.
解答 答案:B.
第一个if表示是否,引导的宾语从句,主句是一般现在时,从句不受限制,根据next week用一般将来时will+动词原形,第二个if引导的条件状语从句,遵循主将从现的规则,从句主语he,故is,故答案是B.
点评 if引导的条件状语从句,1、主将从现 (主句为一般将来时,从句为一般现在时);
eg:If it rains(从句),I will stay at home(主句).
=I will stay at home if it rains.
2、主句含有情态动词 (must、may、can etc.)从句为一般现在时;
eg:If you drive too fast,you may have an accident.
=You may have an accident if you drive too fast
3、主句为祈使句,从句要用一般现在时态;
eg:Don't play computer games if you don't finish your homework.
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