看我写的英语句子有无语法错误

Question

自从举办了活动以来，学生们会主动问候老师并帮老师做事还会主动排队，在公交车上主动让座。
Since activity has been held,not only do they clean actively and throw rubbish into dustbin but also greet teacher as well as help them voluntarily.

Answer 1

Since the (是特指，要有the）activity has been held （强调对现在的影响，可以）,not only do the students（改成”学生们“） do the cleanings (打扫卫生是“do the cleanings",算是固定用法吧） actively, (那个throw rubbish的最好去掉，因为do the cleanings已经涵盖了）but also greet teachers（“老师"用复数） and (改”as well as“为”and“） help them voluntarily.

Answer 2

注意一个句子只能有一个谓语动词。再者 就是注意时态是否符合语境。因此 首先应打好英语基础 从基本语法学起走。英语靠的就是平时的积累。还有就是一些固定搭配是否正确 这样一个句子的正误就判断好了。

Answer 3

Since the start of the movement, the students not only greet the teachers on their own initiatives but also help in doing things. In addition, they also line up in good order as well as offer their seats to others voluntarily when riding in the bus.

Answer 4

Since activity was held(改成一般过去时),not only do they clean actively and throw rubbish into dustbin but also greet teacher（改成teachers） as well as help them voluntarily.

Answer 5

Ever since that programme took place, students were greatly motivated by helping their teachers, queuing up in order and yielding seats to others on bus.

Answer 6

http://zhidao.baidu.com/question/133605252.html