在留学网课中，以下是一些常用的口语表达：

网太卡了- "Sorry, the internet is lagging. I was cut off."

没听懂- "I'm not sure I understand the question. Could you run that by me again？"

不想开摄像头- "Sorry, I currently am not in a good state for video connection."

对方说话声音小- "Could you speak up a bit？"

我明白了- "I see."

我不干了- "I quit!"

放手- "Let go!"

我也是- "Me too."

天哪- "Oh my god!"

不行- "No way!"

我拒绝- "I decline."

我保证- "I promise."

当然了- "Of course!"

慢点- "Slow down!"

保重- "Take care!"

伤口疼- "It hurts."

再试一次- "Try again."

你好- "Hello"

早上好- "Good morning"

下午好- "Good afternoon"

晚上好- "Good evening"

晚安- "Good night"

请- "Please"

建议- "suggestion"

谢谢- "Thank you"

多谢- "Thanks a lot"

对不起，麻烦你- "Excuse me, could you please..."

抱歉- "Sorry for the trouble"

需要帮忙吗？- "Do you need any help？"

谢谢你的帮助- "Thank you for helping me"

这些表达可以帮助你在留学网课中更自信、更顺畅地进行交流。