如果你想告诉别人你的同桌生病了，你可以说:

"My classmate is sick."

"My deskmate is not feepng well."

"One of my classmates is under the weather."

"One of my classmates is not feepng well today."

如果你想问别人的同桌生病了，你可以说:

"Is your classmate feepng okay?"

"Is your deskmate not feepng well?"

"Is one of your classmates sick?"

"Is one of your classmates under the weather?"

希望这些表达能帮到你。