关于英语中 陈述句改为疑问句 和反问句

1. 陈述句中的谓语动词是动词的,提助动词（do或它的其他形式）到句子前面,同时原陈述句中的动词变为原形；
如：LIly helped her mother with housework.
Did Lily help her mother with housework?
2. 陈述句中谓语动词若是be动词,则提be动词到句首；
如,Lily was doing homework.
Was Lly doing homework?
英语的反问句即时反义疑问句,遵守前肯后否,或前否后肯原则,
例如：There is an apple on the table, isn't there?

疑问句将助动词提前
如：will you……？