关于have had to

Question

I have had to wait for you fot the past twenty minutes 这句话中的have had to 是怎样的一个语法结构，为什么不是用I had to 呢？做为现在完成时态解的话，那么其后的wait应该是过去分词的形式啊~望指点。谢谢~

Answer 1

have to 是“不得不”的意思对吧？
然后这里有个for the past twenty minutes ，所以用现在完成时咯对吧？
就是用have done咯，那么就是have had to了～
wait 不是过去分词形式，因为have to它是一个词组，后面跟动词原形的。意思我前面和你解释过了哦～

Answer 2

had to是have to的完成时，第一个have后需加完成时，而I had to只是单纯的过去时。另外，have to为不得不的意思，后面要加动词原形。

Answer 3

是完成时 这里had是过去分词了 wait跟在have to的句式种是to wait不定式

Answer 4

have to 是“不得不”，后跟动词原形
have had to是现在完成时，表示过去对现在的结果

Answer 5

i have 现在时态
i had 过去时态
i have had 现在完成时态

i have had to wait 用wait 因为 to 后用 原形动词
是 固定用法