12-year-old school boy year后加不加s?

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• 12-year-old school boy year后加不加s?
• 为什么 a four-year-old boy中的year可以不加复数,而分数two-thirds中连字符后的third就必须有s?
• It's time for me to go to school 可以 不加to吗以前读过It's time for class 之类的句型都是for后直接加动词不用加不定式to 可是It's time for me to go to school 为什么要加to呢 是不是这个句子错呢
• the number of people each year rises one 中为什么rise后加"s"The number of the people that/who come to visit the city each year rises one million.还有一个 The school in which he once studied is very famous.The school (that/which) he once studied in is very famous.分别仔细翻译一下
• 12-year-old school boy year后加不加s?
• 英语中的基数词和序数词怎样应用1.如果说两千two thousand,那么thousand后面就不加s,如果thousand后面有of那thousand后就加s,2.please turn to page twenty-five.这句话的25页中间用-连接,还有什么情况下用-连接?3.序数词和基数词在分数情况下怎么运用?比如3分之2怎么说?4.I have not had time to clear up,so I am all at sixes and sevens.这句话为什么数字后面要加s?5.We will have to do the experiment a second time.这句话中second中前用了a为什么?什么情况下用定冠词the?6.May is the fifth month of the year.7.什么情况下用序数词什么情况下用基数词?希望知道的人可以逐题回答我,
• 为什么 a four-year-old boy中的year可以不加复数,而分数two-thirds中连字符后的third就必须有s?
• 由同种元素组成的两种物质{如氧和臭氧}会发生化学反应生成新物质（如氧6）吗?
• I is a nine-year-old boy.的中文意思是什么