请说明理由!)If there _______no water ,there _________ no life on
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请说明理由!)
If there _______no water ,there _________ no life on the earth.
A is ,would be B was ;was C were ;would be D were ;would have
请简要介绍该知识点.
If there _______no water ,there _________ no life on the earth.
A is ,would be B was ;was C were ;would be D were ;would have
请简要介绍该知识点.
![请说明理由!)If there _______no water ,there _________ no life on](/uploads/image/z/18331976-56-6.jpg?t=%E8%AF%B7%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%21%EF%BC%89If+there+_______no+water+%2Cthere+_________+no+life+on)
选项:C were; would be
1.首先确定这里应该用虚拟语气
1)水、空气和食物是人们生活不可缺少的,缺一不可,而这里从句说的没有水只是一种假设;主句地球上没有生命是在没有水的情况下的一种假设.
2)这里是对现在情况的虚拟,以下是对各种时间虚拟谓语动词的形式:
if 从句——
* 对现在:谓语动词用过去时态,动词 be 用 were;
* 对过去:谓语动词用过去完成时态
* 对将来:谓语动词有三种情况——
过去时
should + 动词原形
were to + 动词原形
主句——
* 对现在或将来:谓语动词用 would + 动词原形;
* 对过去:谓语动词用 would have + 动词原形
2.存在句型应该是 there be,there have 是错误形式,因此 D 项中的would have 不正确.
1.首先确定这里应该用虚拟语气
1)水、空气和食物是人们生活不可缺少的,缺一不可,而这里从句说的没有水只是一种假设;主句地球上没有生命是在没有水的情况下的一种假设.
2)这里是对现在情况的虚拟,以下是对各种时间虚拟谓语动词的形式:
if 从句——
* 对现在:谓语动词用过去时态,动词 be 用 were;
* 对过去:谓语动词用过去完成时态
* 对将来:谓语动词有三种情况——
过去时
should + 动词原形
were to + 动词原形
主句——
* 对现在或将来:谓语动词用 would + 动词原形;
* 对过去:谓语动词用 would have + 动词原形
2.存在句型应该是 there be,there have 是错误形式,因此 D 项中的would have 不正确.
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