One possible version： I think online courses have three advanta?ges.First if we take traditional courses we have to go to school. If we don't go to school then we can't know what the teachers teach in class. And we also have to get to school on time. But if we take online courses we can take the courses at any time and any place.Second only a few people can go to the top schools to learn if they take traditional courses. But any person can take online courses offered by the top schools in the world.Third it is much cheaper to take online courses than to go to a real school. Some online courses are offered even for free.

 One possible version： I think online courses have three advanta?ges.First if we take traditional courses we have to go to school. If we don't go to school then we can't know what the teachers teach in class. And we also have to get to school on time. But if we take online courses we can take the courses at any time and any place.Second only a few people can go to the top schools to learn if they take traditional courses. But any person can take online courses offered by the top schools in the world.Third it is much cheaper to take online courses than to go to a real school. Some online courses are offered even for free.