then what could be more important than purifying the water your family drinks?then 为什么要用COULD BE,COULD不行吗?purifying为什么要加ING形式.

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then what could be more important than purifying the water your family drinks?then 为什么要用COULD BE,COULD不行吗?purifying为什么要加ING形式.
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then what could be more important than purifying the water your family drinks?then 为什么要用COULD BE,COULD不行吗?purifying为什么要加ING形式.
then what could be more important than purifying the water your family drinks?
then 为什么要用COULD BE,COULD不行吗?purifying为什么要加ING形式.

then what could be more important than purifying the water your family drinks?then 为什么要用COULD BE,COULD不行吗?purifying为什么要加ING形式.
你怎么把then和what连在一起了呢?
then只是一个连词,what could be more important than purifying the water your family drinks?才是一个完整的句子
then表示那么
could当然不行了,could是个情态动词,你先假设把它去掉
那么问什么更重要,我们是不是一般都这样问呢
what is more important?
加上情态动词,就是 what could be more important?
BE动词是绝对不能省略的,省略的话,句子结构就不完整了
purifying the water在句中做宾语
在英语中,若一个动词以不定式或者是ing形式出现,则这个动词就具有了名词的性质,可以在句中充当宾语或者是主语,所以这里用purifying,就是为了使它变成名词,然后才能在句中充当宾语啊

Then what意思是那么什么。。
系动词Be后加形容词（important）作表语
Than是介词，后面应该加动词的ing形式

then表示语气——那么
be是本句主动词，不能省略。注：此句话改成陈述句形式为——Sth could be more important than~~~~~。所以不因省略be动词。
more than 后面只能跟名词或动名词，不能直接跟动词，所以加ing.

翻译：那么还有什么比净化家庭饮用水更重要呢?"
purifying the water your family drinks"动名词短语做"than"的宾语！
could be 是谓语动词，情态动词后要加be 动词的，不可以直接使用！

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