情态动词不允许直接做谓语,但可以与其它动词原形一起做谓语;

     主要的情态动词:

             shall

              can

              could

              must

              have to

              need

              should

               will

                would

                may

                might

             i           would                   eat                                  the apple; 

            主语       情态动词             谓语(动词原形)                 宾语