什么时候用students'而不是student's

什么时候用students'而不是student's 什么时候用be,而不是am,is,are STU*fun(STU a[],int 英语where do the new students come from?the new students是第三人称,为什么用do而不是does? 德语什么时候用ich bin 什么时候用es is mir在什么时候需要用mir ist 而不是ich bin The number of the students in our class______60 为什么用is而不是has? no student作主语谓语用单数还是复数?注意是no student而不是students. you'd better describe yourself to us students.这里是否应该用our而不是us? feel 在什么时候为系动词什么时候是实意动词、、Most students think grammar is hard to learn ,but Grace feels d_____（不同）、为什么要填differently 而不是different、、 ---in out class are listening to the teacher carefully（a.Not all students b.Not all the students 定冠词the什么时候用,什么时候不用啊? she wasn't understood.为什么用wasn't,而不是didn't?什么时候用is什么时候用does? 用所给词的适当形式填空和句型转换用所给词的适当形式填空1.Great changes _____(take place) here in five years.2.We ___(visit) the West Lake some day.句型转换The students won't go to school to study.(改为肯定句)The stu most of students 于 的区别（ ）student English in our school.为什么用most student 而不是 most of students ?急需答案啊!1拜托啦!~~~~(>_ 什么时候用like to do 而不是doing ? 在东南方用什么介词 ? scanf(%s,stu[i]. The professor came into the office,_____by his two students为什么用followed 而不是following求详解The professor came into the office,_____by his two students 为什么用followed 而不是following求详解 Here are the results of the student activity survey at Green High School.为什么用student,而不是students? Before class the teacher （divided）the students into six groups.括号中为什么要用divided 而不是divide 呢