1. I need some medicine.
我需要一些药。
还能这样说：
I need to buy some medicine.
Please give me some medicine.
应用解析：
daily needs 日用品；
satisfy one's need 满足某人的需要；
needs test 经济情况调查
2. I will buy some western medicine.
我要买一些西药。
还能这样说：
I want to buy some western medicine.
I would like to take some foreign medicine.
应用解析：
go west 完蛋；用光；毁灭；归西；上西天；
due west 向正西方；
go to the West 到西部去
3. Cough syrup will do.
止咳糖浆就可以了。
还能这样说：
Just a bottle of cough syrup.
A bottle of cough syrup, please.
应用解析：
whooping cough 百日咳；
cough crane 鸣鹤；
cough drop 咳嗽糖；
cough lozenge 咳嗽片；
cough syrup 止咳糖浆
4. How often do I have to take the medicine?
我应该多长时间吃一次药？
还能这样说：
Please tell me how often I should take the medicine.
How often should I take the medicine?
谚语：
Take things as they come.
既来之，则安之。