经常问：主语(subject)是一人或多于一人:
1.They come from France.(不要加S)
2.Tom and Jane come from England.(不要加S)
3.Tom comes from England.(单数要加S)
4.He/She comes from Beijing.(单数要加S)
5.My cat is fat.It knows how to come back home every evening.(单数要加S)
*除了第一人单数(我) :I come from Beijing.(不要加S)
**多看你将会明白!Good luck.