have to ,时态,Must,it is/was neccesary to doit was necessary for him to go out last night看了很多不同出版社的参考书答案都是 i've had to go out last night请问1.怎么理解这个答案,不是for him 怎么答案变成了i 做主

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have to ,时态,Must,it is/was neccesary to doit was necessary for him to go out last night看了很多不同出版社的参考书答案都是 i've had to go out last night请问1.怎么理解这个答案,不是for him 怎么答案变成了i 做主
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have to ,时态,Must,it is/was neccesary to doit was necessary for him to go out last night看了很多不同出版社的参考书答案都是 i've had to go out last night请问1.怎么理解这个答案,不是for him 怎么答案变成了i 做主
have to ,时态,Must,it is/was neccesary to do
it was necessary for him to go out last night
看了很多不同出版社的参考书答案都是 i've had to go out last night
请问1.怎么理解这个答案,不是for him 怎么答案变成了i 做主语了?
2.was 是一般过去时态呀,怎么到了下面变成了have had了?

have to ,时态,Must,it is/was neccesary to doit was necessary for him to go out last night看了很多不同出版社的参考书答案都是 i've had to go out last night请问1.怎么理解这个答案,不是for him 怎么答案变成了i 做主
it was necessary for him to go out last night
【翻译】对他来说,昨天晚上出去有有必要的.
也就是说,他昨天晚上出去是有必要的,所以主语变成了I
这是第一个问题的解释
对于第二问题：
was是一般过去式不假,但是have had是现在完成时,它可以用来表示过去发生的动作,
如：I have finished my homework.我已经完成了我的作业.
此外,have to 的意思是“不得不”,原句中说,他出去是有必要的,也就是说可以理解为“他不得不出去”
希望我的解释能够帮助你更好地理解,如果还有疑问欢迎继续提问,

LZ不用深究，

第一句说他昨晚应该出去的，对于第二句的时态，可以理解为他是昨天已经出去了，相对第一句来说是完成时了。
对于为什么是i可能与楼上说的一样。

很多时候是地域的方言问题。不用很执着

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