改为否定句的简单英语句子

the students are not from beijing.
sandy doesn't often listen to music on weekends.
we are not good at singing.

1. The students are not from Beijing/The students do not come from Beijing.
2.Sandy does not often listen to music on weekends
3.We are not good at singing

1.The students don’t come from Beijing.
或 The students are not from Beijing.
因为be come=come from

2.Sandy doesn't often listen to music on weekends.
因为Sandy是第三人称用助动词does，否定加not

3.We are not good at singing.
有Be动词（is，am，are）的改否定句直接加not

The students are not from Beijing
Sandy never listen to music on weekends
We are not good at singing

我觉得第一题要是是一句话的话错了吧？没有谓语动词啊，应该加上come/are
第二题原句应该是第三人称单数listens,要是改为否定句的话
1：The students aren't from Beijing
2.Sandy don't often listen to music on weekends
3.We are not good at singing.

The students are not from Beijing.
Sandy does not often listen