根据要求写作文。
Writea passage about the advantages and disadvantages of online leanr think about the following aspects.
(1)The advantages of online learning
(2)The disadvantages of online learning
(3)Your suggestions about how to study online fecively

I think the advantages of online learning are as follows.When we can not go to school,network teaching plays a very important role.' (时间状语从句) It breaks the limitations of traditional teaching in time and space.Besides,it is easy to broaden the knowledge of college students, making the academic evaluation more open. However," Every coin has two side" Teachers can't know more about students, students can't make progress together and communicate with other students.Students must have good self-discipline. It is impossible for every student to have self-discipline. (it做形式主语) Besides,the quality of courseware on demand is greatly affected by the network environment. There are a large number of online teaching students, so we should make adequate preparations.Besides,We should finish the homework which is assigned by the teacher. (定语从句)