1.the boy is caomes from USA 2.he gave up help the old man 改病句!快!速度!还有：3.Tom lives in China 3 years ago.谢啦~~~

come from 意为“来自”，是动词+介词词组，因而第一句应为：The boy comes from USA.
give up 意为“放弃”，放弃做某事，后跟的实义动词的现在分词形式，即give up doing.因而第二句应为：He gave up helping the old woman.
从第三句的时态就可以得知，过去时态，谓语动词也应变形为过去时形式，因而应为：Tom lived in China 3 years ago.

1 The boy is from USA
The boy comes from USA
2 he gave up helping the old man
3 Tom lived in China 3years ago.

1 the boy comes fron USA 或者 the boy is from USA
2 he gave up helping the old man
3 Tom lived in China 3 years ago

1.The boy comes from USA.
2.He gave up helping the old man.
3.Tom lived in China 3 years ago.