Peter often helps in the house at the weekend.(改为一般疑问句)

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Peter often helps in the house at the weekend.(改为一般疑问句)
Does Peter often help in the house at the weekend?
彼得在周末时经常在房子里帮忙吗?
再问：为什么用does呢？又为什么把helps改为help了呢？
再答：当句子中没有be动词、情态动词，而只有实义动词helps时，要加上助动词do或does来改变语序、帮助构成疑问句。加了does以后就可以表示第三人称单数了，help要改回原形。
再问：为什么要变，帮忙解释一下子了。
再答：题目不是要变为疑问句吗？它和陈述句的不同之处就是要变换语序，把动词放在主语之前。如果有be动词和情态动词这些，就可以直接往前移行了。如Are you...? Can you ...? 但这句子只有helps，你能改为Helps+主语...?吗。不行的，只能加do或does这些词在句子开头，才变为疑问语序。
再问：我只是问一下为什么加助动词之后helps变为原形了
再答： helps加s是表示第三人称单数当主语，加了does以后就接管了这个功能了，help不用再保留s。
再问： do/does+动词原形可以不
再答：就是这样了。do\does+原形help。

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