too+adj/adv+to do sth 表示太.....而不能做某事,其反义疑问句要用肯定形式
ex.he is too young to go to school,is he?
当主句的主语是i或we时,且谓语动词是think,believe,suppose,expect,consider等词时,其后跟宾语从句,附加问句的主语与谓语要与宾语从句的主语和谓语一致。
ex.i think he will come ,won't he ?
let us 表示“允许我们做某事吧”,附加疑问句用will you
ex.mom,let us watch a movie ,will you?
let us 表示提议,意为“我们去做某事吧”,附加疑问句用will you .