"I want to play tennis, but I caught a cold."

Translation: 我要打网球，但是我感冒了。

[DuDaoge]

Should also allow 可是 as an alternative to 但是。

[GustavoQue434358]

I omitted the subject in the second clause and got marked as wrong
我要打网球，但是感冒了。
I think you can do that in Chinese when the subject can be inferred from context, or the previous sentence

[Jonny499474]

I'd also be interested to know if with context, it's okay to drop the second 我

[theShmuli]

why does yao mean want?

[hippietrail]

Yao normally means want. That's the first meaning for it that I learned.

[Gabrielle145359]

要 can mean "want," "need," or "will."