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Could a shortage of shut-eye also (be helping to) make us fa

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Could a shortage of shut-eye also (be helping to) make us fat?(be helping to)是什么用法?
Could a shortage of shut-eye also (be helping to) make us fat?
请问这里(be helping to)是现在进行时吗? 
这句话的句子结构,如主语,谓语,宾语是什么?
 
Could a shortage of shut-eye also (be helping to) make us fa
主语是a shortage of shut-eye,谓语是 could...be helping 宾语是 to make
是进行时.
再问: 你好,请问这个句子是什么时态?(be helping to)是现在进行时?
再答: 是含有情态动词的进行时。但could表示推测