DO .IS ...过去式是Did...was...还是Did...is...DO .IS ...过去式是Did...was...还是Did...is..举个例,方便理解

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DO .IS ...过去式是Did...was...还是Did...is...DO .IS ...过去式是Did...was...还是Did...is..举个例,方便理解
DO .IS ...过去式是Did...was...还是Did...is...
DO .IS ...过去式是Did...was...还是Did...is..
举个例,方便理解

DO .IS ...过去式是Did...was...还是Did...is...DO .IS ...过去式是Did...was...还是Did...is..举个例,方便理解
这个不一定.根据意思决定.
比如:
Do you think he is smart?译为你现在认为他聪明吗
Did you think he was smart?译为你过去认为他聪明吗
正常来说前后时态应该是一致的.
但是有特例.
如果后面陈述的是客观事实.那么后面就不需要变过去式.
比如:
Do you agree that earth is round?你现在认为地球是圆的吗?
Did you agree that earth is round?你过去认为地球是圆的吗?
地球是圆的是客观事实.不需要改变时态.