I had hopted to stay there for one more week ,but i changed my mind 为什么had用

I had hopted to stay there for one more week ,but i changed my mind 为什么had用 I have to stay here 和 i have had to stay here 区别是什么? I had to stay home and look after my sister i had to stay at home relax 改错 Because it was raining heavily,I had to stay at home.（改为同义句 ）Because it was raining heavily,I had to stay at home.改为同义句 （ ）（ ）the（ ）rain,I had to stay at home. I never really had it coming .I want you to stay away from my heart . I was ill,so i had to stay at home改为现在分词作原因状语 3Q ..I never had to say goodbye You must have known I wouldn ' t stay 英语填空 I had to stay at home with n____ to do he being ill,i had to stay at home.与he is ill,.有什么区别? —I caught ____bad cold and had to stay in ____bed . I had to stay there （for a week）.就括号部分提问 Even if I had a million reasons to leave you,I would still look for one to stay If I had 24 hours to live,If I cannot get togeter with you,I would stay with i want you to stay my mother was ill,i have to stay at home中的have tomy mother was ill,i had to stay at home中的had to 改成must行不行,强调妈妈生病了,我必须在家 I had to stay at home yesterday because it rained改为一般疑问句--------you------ -----stay at home yesterday because it rained Yesterday I was ill and I ______at home the whole day.A.have to stay B.have stayed C.had to stay D.had stayed为什么要选C?其它的为什么是错的?