Greeting one with a huge yawn

Yawning is a reflex that signs something. It tells us that the brain lacks enough oxygen and needs to be supplied that's why we yawn by letting in some oxygen. Yawning is also helps us know our brain is working by some electricity current is working on some neurons to make it ready to think and response for the next seconds of time. So I think yawning does not only means boredom. It can mean a lot of other positive things. Next time students yawn at you while lecturing, think positively, then have a ready question for that particular student to get even if you find yawning annoying and disturbing and a kind of show of disrespect.

It is of course not polite to yawn before others, especially when you are greeting others. But sometimes it is hard to control it. Yawn is a reaction of lack oxygen, of course when we are sleepy, we tend to make more yawns. A student yawns before a teacher not mean he or she thinks the teacher's lecture is boring, but maybe a sign of lack of sleep. It is really funny to see that animals also yawn. Just as they also can laugh, cry... ...You know, one of my favorite TV programs is "world of animals". It is very interesting.

It's so shameful to yawn in front of a person you don't even know. Specially when you yawn without covering your mouth, and the inside of your mouth is open for everybody to see. It's a sign that you lack sleep and oftentimes misconstrued as being bored when it's not really that. It's just simply. . .you lack sleep. But nonetheless, it's disrespectful to yawn in front of your teacher. She will misconstrue it as ....you are not interested in what she is discussing.

it's not good to yawn in front of someone,, especially when you're greeting,, that's not respectful,, and teachers should not yawn in front of their students, they are showing how boring their classes are