secondary school in the US usually covers seven years,grades

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/04/29 05:47:09

secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?
还有 light travels faster than sound 那个travel为什么要加s?

英语语法中,当句子的主语是单数名次或者代词的时候,句子的谓语动词要加 s,你给的两个句子中的主语--secondary school 和 light 都是单数名词,所以谓语动词 cover 和 travel 需要加s.如果不懂可以再问.

secondary school in the US usually covers seven years,grades Secondary school in the US usually covers seven years ,grade school in the Us usually ----------{cover]seven year s 填什么 The students in Beijing Sunshine Secondary School have some This is the school ____I worked seven years ago.A.in which we are in the same school,but in different grades.“grades”为什 Our school head teacher usually gives us a speech in the p__ Are you satisfied with the grades you received in school? in the morning,he usually h_____to school Hello,my name is Peter.I study at a secondary school in the 填介词 Students usually go to school at ___ seven o'clock in Ch We are in the same school,but in different grades.A:Do you h