第1个回答 2011-10-11
1.he was playing basketball yesterday.这个可以当做是过去进行时来理解！
2.he playing basketball yesterday。句子中的playing是一个非谓语动词，不能用作谓语！
3.他昨天骑脚踏车到乡下去。可以这样翻译;he rode a bike to the countryside yesterday.
4.他正在唱歌。he is singing.可以加一个宾语补足语a song。意思比较完整一点！he is sing a song.或者是he is sing songs.
5.你的爸爸昨天来看我。your father saw me yesterday.你这样翻译就成了你的爸爸昨天看见我了！
看可以理解成是看望或者是拜访。your father paid a visit to me yesterday.
6.his brother.拼写错误！、
7.他每天都努力工作（work hard）。 he work hard everyday.谓语动词应该用第三人称单数！
8.你的弟弟喜欢游泳。your brther enjoys swimming very much..
9.他过去是个好学生。he was a good student.还差一个状语成分！he was a good student in the past.