Yawn and say I'm tired.

打哈欠并说“我累了”。

She couldn't help but yawn.

她忍不住打了个哈欠。

He let out a yawn, looking very sleepy.

他打了一个哈欠，显得很困。

She covered her mouth to stifle a yawn.

她捂住嘴巴以抑制打哈欠。

In the classroom, students began to yawn.

课堂上，学生们纷纷打哈欠。

She tried to hide her yawn during the meeting.

她在会议中试图掩饰她的打哈欠。

The baby gave a cute yawn before falling asleep.

宝宝在入睡前打了一个可爱的哈欠。

I couldn't stop my yawn while watching the boring movie.

我在看那部无聊的电影时忍不住打哈欠。

The lecture was delivered tediously, causing many students to yawn.

讲座冗长乏味地进行，导致许多学生打哈欠。

He let out a big yawn after a long day at work.

他在工作了一整天后打了一个大哈欠。