How do you change a normal sentence in chinese into the future tense
For example;
I am buying a drink ----------I will buy a drink

Question

How do you change a normal sentence in chinese into the future tense
For example;
I am buying a drink ---------->I will buy a drink

Answer

我  正在  买  饮料 => 我  要  买  饮料

Answer

put it in a simple way, you just add 要,将, 准备 or 将要 in front of verb.

examples:

original sentence: 
我看一场电影.

future tense:
1. 我要看一场电影。
2. 我将看一场电影。
3. 我将要看一场电影。
4. 我准备看一场电影。

Using which one depends on the context. Sometimes, they all work in a sentence like the example, but sometimes, you'd better pick a specific one. It takes time to cultivate the language feeling.

Answer

I want to help you ,ban , i cant give you a reason in English