she's had to go to Chicago on a business trip请问这个句子,主语后面的's是什么意思,had to不是谓语吗,为什么会有一个's?

问题描述:

she's had to go to Chicago on a business trip
请问这个句子,主语后面的's是什么意思,had to不是谓语吗,为什么会有一个's?

全句是
She has had to ……
has 可以用's代替
就像I've no idea 一样

has had to
现在完成时态~

是has的简写
此句是现在完成时

其实……它错了……