Teachers won't use chalk on a blackboard.

老师们不会在黑板上用粉笔。

The teachers won't write on the blackboard with chalk.

老师将不会再用粉笔在黑板上写字。

Each child had a small board and a piece of chalk.

每个孩子都有一块小黑板和一块粉笔。

After class, students are supposed to clean the chalk off the blackboard.

下课后，学生应该擦掉黑板上的粉笔。

As there were no pens children used chalk to write on their slates.

因为没有笔，孩子们用粉笔在石板上写字。