将they are pretty.改为一般疑问句

They are pretty 改为一般疑问句 They are pretty. 改为疑问句. 将They are cleaning the window.改为一般疑问句 怎么把They are pretty 改成一般疑问句 They are swimming.(改为一般疑问句) They are speak English 改为一般疑问句 they are their erasers 改为一般疑问句 They are happy.改为一般疑问句, they are nine改为一般疑问句 they are my grandparents 改为一般疑问句 They are drivers.改为一般疑问句 they are for you改为一般疑问句