1、They came to china in 1990（变成一般疑问句）
Did they come to China in 1990?
2、I was ill for two days last week （变成一般疑问句）
Were you ill for two days last week?
3、The twinso go to school on foot every day .（变成一般疑问句）
Do the twins go to school on foot every day?
4、 she washed the clothesline last sunday .（变否定句）
She didn't wash the clothes last Sunday.
5、 She is going to go shopping tomorrow .（变成一般疑问句）
Is she going to go shopping tomorrow?
6、MY mother likes her students .（变成一般疑问句）
Does your mother like her students?
7、DO you watch Tv on sunday （用lastsunday改写成过去时态的句子）
Did you watch TV on Sunday?
8、The boys were having PE lesssons at 3:30 yesterday afternoon.（用 were having PE lesssons 提问）
What were the boys doing at 3:30 yesterday afternoon?
9、 He got 100 in his English last term.(用last term 提问)
When did he get 100 in his English last term?
10 She is waiting forat the school gate.(用 a bus 提问)
What is she waiting for at the school gate?
希望我的回答能够帮到你,