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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