你这说的是need吗?
had是have的过去式,所以had to当然就是have to的过去时了啊.举个例子说：He said that he had to go.他说他必须要走了.
will是表示将来时的一个词,后面接原形.例句：We will have to finish the work tomorrow.我们将要在明天完成这项工作.