Everybody, please gather in the conference room.

A new project begins.

I attended a math class today.

I will teach mathematics to new students tomorrow.

When the class started, everyone stood up.

Everyone stood up when the teacher entered the room.

The use of mobile phones is prohibited during class.

He is suffering from orthostatic hypotension.

There is a class observation at my son's school tomorrow.

My child attends a supplementary school every Saturday.