gasp : verb, means to catch one’s breath as a sign of pain or astonishment:

He gasped when he saw the size of the tooth.

1. to gasp at sth : to take a quick deep breath with your mouth open, especially because you are surprised or in pain. 喘气，倒抽气

2. to gasp (sth) out: to have difficulty breathing or speaking 透不过气；气喘吁吁地说

yawn：verb, means to open your mouth and breath out deeply, due to tiredness or boredom: 打哈气

They started to yawn after the third hour in the meeting.

辨析：

breath : to take air into your lungs and send it out again

sigh: to breath out slowly and make a noise that shows you are disappointed, tired, relieved etc

pant: to breath quickly and noisily through your mouth, because you have been using a lot of effort 气喘吁吁

gasp: to breath very quickly and deeply and with difficulty 上气不接下气

snore: to breath noisily while you are sleeping

wheeze: to breath with difficulty, making a noise in your throat and chest, because you are ill. 呼哧呼哧地喘气

His asthma was making him wheeze.

例句：

Ollie gasped with pain and slumped forward. 奥利疼的直抽气，往前栽倒。

The audience gasped at the splendor of the costumes. 华丽的服装令观众惊叹。

Brendan climbed slowly, gasping for air/ breath. 布伦丹上气不接下气地缓慢攀爬。

He came to the surface of the water gasping for air. 他浮出水面急促的喘着气。

They gasped in astonishment at the news. 他们听到消息惊讶得倒抽一口气。

She gave a little gasp and clutch George’s hand. 她轻轻地倒吸一口气，抓住乔治的手。