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?
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