我得做饭.为什么是I have to cook.为什么要加have和to?自学英语,

我得做饭.为什么是I have to cook.为什么要加have和to?自学英语, I have to cook 为什么I want to have a try.要加to I should have listened to you yesterday.为什么加HAVE I have nothing to complain of.为什么要加of? I have just moved to a house in Bridge Street.为什么要加HAVE I have to cook 改为同义句 i have many thing to do.我有需对事情要做 为什么要加TO? i have been to shanghai为什么加been? I have to see the doctor.为什么要用HAVE? I have to turn off the light.为什么要加the~有时我这个分不清～不知道是加the 还是a I have to go to park to learn the piano中为什么要加第二个to?3Q