改错
1.The children were running on the playground as fast as they can.
2.Since her husband had died,so she had to support her family.
3.He won't go out until his mother will come.
4.He was very foolish that he didn't pass such an easy exam.
5.Tom had gone out as soon as his mother got home.
6.It was three months since he came to our school.
8.The streets in Nanjing are wider than Shanghai.
9.Whatever three is pienty of sun and rain,the fields are green.
10.She sings songs as if she is a bird.