题目内容
16.-Sam,do you know if Alice to my party next week?-I think she will come if she free.( )
| A. | comes; is | B. | comes; will | ||
| C. | will come; is | D. | will come; will be |
分析 ---山姆,你知道下周爱丽丝是否会来?
---我认为如果她有空就会来.
解答 答案:C.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next week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she三单,故答案是C.
点评 1. if从句用一般现在时,主句用一般将来时
If he runs he'll get there in time.如果他用跑的,他就会及时赶到那儿. The cat will scratch you if you pull her tail.如果你拉猫的尾巴,它就会抓你.
2..if从句用一般现在时,主句用情态动词
If the fog gets thicker the plane may/might be diverted.如果雾在大一些,飞机可能就会改在别的机场降落.
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