上课和下课分别用英语怎么说?

上课: to attend class

Relative explainations:
<school> <have classes> <take class> <give a lesson> <have lessons> <to take lessons> <to teach> <to go to class>

Examples:
1. 在上课期间内不要离开学校。
Don't leave the school precincts during school hours.
2. 她准是暗地里一直在上课。
She must have been having lessons on the sly.
3. 不论阶级，种族，性别，人人都可进这所学校上课。
Everybody can come to this school, without respect to class, race, or sex.
4. 因为流行性感冒全校停止上课。
The school was closed because of the flu.
5. 在孩子们住院期间, 有个私人教师给他们上课.
There is a tutor to teach the children while they're in hospital.

下课:
1. class is over
2. That's it
3. dismiss
4. to get out of class
5. to dismiss class

Examples:
1. 那些男孩子们渴望下课。
The boys were itching for the lesson to end.
2. 下课后，班长把练习册收了起来。
The monitor collected the exercise bo