2、学习英语
3、教汉语
4、步行去上学
5、foreign lauguages
6、lots of/a lot of
7、twenty years ago
8、go to school
三、1、working
2、teach，taught
3、making
4、go，goes
5、was，studied
四、1、He is playing the piano now
2、Ms Zhang was a teacher five years ago
3、Did you walk to school yesterday？