Is 不是動詞嗎?為什麼後面可以再接一個動詞

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.