my father used to smoke与used smoke的区别?

my father used to smoke与used smoke的区别? my father used to smoke a lot 另一种说法 my father used to smoke改为一般疑问句 my father -----smoke a lot.lt is bad . a.used for b.used to My parents used to smoke after meal. 请帮我看看这两个句子的区别.my father used to smoke ,but he gave it up a c you used to smoke,___you? My father used to smoke,but now he follows the doctor`s a___ My father used to smoke.But now he doesn't.合并为一句 My uncle used to smoke a lot.(改为一般疑问句) I used to smoke中smoke怎么不用smoked? 有没有 Used he to smoke?