课下你不必擦黑板的英文

you needn’t erase the backboard after class

• 课:    class
• 下:    below; down; under ...
• 你:    you
• 不必:    need not; not have ...
• 板:    board; plank; plat ...

例句与用法

1. You needn ’ t erase the backboard after class
   课下你不必擦黑板。
2. You needn t erase the backboard after class
   课下你不必擦黑板