Tìm lỗi sai trong các câu sau

tìm lỗi sai trg các câu sau:
1.We don’t cycle fast.
2.She worked effective so she got high salary
3.They are fast comers
4.Thanh and Hoa are good cyclists.
5.We are bad swimmers.
6.She is a skillful sewer.
7.Mai is a careless tailor