现在完成时主语加have或has或had+to加动词原形变疑问和否定句要借助什么

Question

如题所述

Answer 1

这是两种不同情况，现在完成时谓语部分有助动词have/has所以变成疑问句时只需要把助动词have/has提到主语前，如
Have you finished your work?
否定句也只需要在助动词have/has后面加否定词not就可以了，如
He has not finished his work.
但是have to/has to/had to 就不同了，它就像一个实义动词，变成疑问句时需要根据主语人称在句首加助动词do/does/did
如Does he have to go there?
Do you have to leave?
变成否定句在have/has/had前加don't/doesn't/didn't如
Tom doesn't have to work.
We don't have to hurry.

Answer 2

完成后下，have, has 后面加not 构成否定。
had to 需要助动词did来帮助。