It(This) is/was the first(second,third……) time that sb.have/had done sth.从句中的时态为什么必须用完成时?

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It(This)is/wasthefirst(second,third……)timethatsb.have/haddonesth.从句中的时态为什么必须用完成时?It(This)is/wasthefi

It(This) is/was the first(second,third……) time that sb.have/had done sth.从句中的时态为什么必须用完成时?
It(This) is/was the first(second,third……) time that sb.have/had done sth.从句中的时态为什么必须用完成时?

It(This) is/was the first(second,third……) time that sb.have/had done sth.从句中的时态为什么必须用完成时?
因为在你说这是我第一次（干什么）的时候,你是正在或者是已经做了某事,所以后面完成时态.比如：
这是我第一次骑马：this is the first time that i have ridden a horse.
但是如果你写成：this is the first time that i ride (am ridding) a horse.你会让人觉得你说这句话的时候你还是骑在马背上.
那时我第一次骑马it was the first time that i had ridden a hose.（你已经骑过马了）.
如果你要说那将会是你第一次骑马,it will be the first time that i ride a horse (你还没有骑过马）.

是的，如果表将来则例外。
如：
It is the first time that I will visit the city.

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