It is one's turn to do sth.句子时态变,是be动词变还是turn变?

问题描述:

It is one's turn to do sth.
句子时态变,是be动词变还是turn变?

恩,是“be”变,我无耻的YY了这一句话啊。。。。。
因为turn在这句话里是个名词,句子变时态是动词变。

是be变

当然变 BE 动词了
例如
it will be your turn to do it
it was my trun to do it
it's my turn to do it
one's turn 该轮到某人了,这里是名词性短语.不能左右时态的变化