is是be動詞,後面可以接一般動詞,這個動詞是現在分詞Ving或過去分詞V(p.p.)。be+Ving是現在進行式,表示正在進行的動作,如Sunny was watching TV when she came home.be+V(p.p.)是被動語態,如we were warned not to stay out late at night.The roof of the house was damaged in the storm.