how often (does) she stay up late?Does she (stay) up late?为什么第一个句子 (does)用第三人称单数形

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• how often (does) she stay up late?Does she (stay) up late?为什么第一个句子 (does)用第三人称单数形how often (does) she stay up late?Does she (stay) up late?为什么第一个句子 (does)用第三人称单数形式,第二个句子 (stay)用原形
• how often (does) she stay up late?Does she (stay) up late?为什么第一个句子 (does)用第三人称单数形
• 1.Lily likes running in the morning,but she doesn't like to run this morning.2.How many students in your class often take a bus to school?Only one goes to school by bus.3.Don't shout in class.Listen to the teacher carefully.4.He is good,Let him help you to water the trees.5.He does't want to be late for school,so he gets up early every morning.6.Some of the students in our class come from Japan.One of them come from America.按照上面句子的形式造句子,每个造一句.
• (x-1/2x)^9 展开式中x^3的系数等于?
• (x^2-1/2x)∧9中X^9的系数为?