4．keep back保留；阻止；隐瞒；拒留

　 She was in deep sorrow。but she kept back her tears．

3．keep up with跟上

　 She can’t keep up with others．

2．keep up坚持

　 Keep up your courage and you will succeed．

1．keep on doing sth．继续或反复做某事

　 Marx kept on studying English and using it when he lived in London．

4．have difficulty in／find difficulty in／have trouble in 做……有困难

We have／find difficulty in writing the composition．

We have trouble in writing the composition.

3．have(deep)effects on对……有(深远)影响

The book has great effects on his life．

2．have words with争吵

They’ve had words with her about money．

1．have a word with sb．和某人说句话

Could you spare a few minutes? I want to have a word with

18．go down下降，降沉，下沉

　 The moon has gone down．

17．go up上升，上涨

　 The goods have gone up in quality．