Not only 后的句子引起半倒装，but also后的句子使用陈述句语序。 not only did he help his sister with her homework, but also he cooked a meal for his mother. Do和does的区别和用法区别是：do 是动词原形，用于第一人称、第三人称的复数 (i/you/we/they)。does 用于第三人称单数 (he/she/it) does 用于第三人称单数。do用于一般现.
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