1.help帮助,  kiss亲吻,  talk说话,交谈,  listen听,  pull拉,拽,  push推,  clean打扫,  at this moment现在,此刻,  pastry糕点,点心,  husband丈夫,  leave for work去工作,  city城市,  ride the bus乘坐公交车. 

2.Are they ………ing? 他们正在……..吗?

   Yes, they are./No, they aren’t. 是的./不是.

   Are they talking?  Yes, they are.

   Are they pushing?  No, they aren’t.

   Are they cleaning?  Yes, they are.

   Are they helping?  No, they aren’t.

   What are they doing?

   They are ………..ing.

   What are they doing?

   They are kissing.

   They are listening.

   They are talking.

   They are pulling.

   They are cleaning.

   They are helping.

   They are pushing.