B. Write and say.
从“am”“is”“are”中选择正确的单词,将童谣补充完整,然后念给大家听一听吧！
Playing, playing, I ______ playing.
Riding, riding, you ______ riding.
Swimming, swimming, he ______ swimming.
Eating, eating, she ______ eating.
Talking, talking, they ______ talking.

am are is is are