We yawn when sleepy or bored.

Every time I looked at him, he was yawning.

They were all so tired that they could do nothing but yawn.

He yawned heavily.

Being bored, the audience began to yawn.

I suppressed a yawn.

Cover your mouth when you cough, sneeze, or yawn.

We yawn when we are short of oxygen.

You should have seen yourself, yawning all through the meeting.

His lectures are terribly boring.

Tom is yawning.

Tom gave a big yawn.

"If you are sleepy then you should go to bed" "I am still not tired" "But all you have been doing is yawning for quite some time, you should go to bed to avoid overworking yourself." "You want me to go to bed that much?"

Tom yawned.

Yawning in a meeting isn't polite.

Tom was yawning.

Tom says he saw Mary yawning.

I tried not to yawn.

I yawned.

Try not to yawn.