I have a fever. 我发烧了。wo3 fa1 shao1 le5。

I have a reservation. 我已经预订了。wo3 yi3 jing1 yu4 ding4 le5。

I have a headache. 我头疼。wo3 tou2 teng2

I don’t understand. 我不明白。wo3 bu4 ming2 bai2。

How much does it cost? 费用多少？fei4 yong4 duo1 shao3？

How much does it cost to the city center? 到市中心多少钱？dao4 shi4 zhong1 xin1 duo1 shao3 qian2？

How much does it cost to the airport? 到机场多少钱？dao4 ji1 chang3 duo1 shao3 qian2？

How are you? 你好吗？ni3 hao3 ma5？

 hospital 医院yi1 yuan4