一个语法小问题.does make you feel better.为什么加does.(全句见补充)

问题描述:

一个语法小问题.does make you feel better.为什么加does.(全句见补充)
but research has shown that the very act of taking a medication that you think will make you better,often does make you feel better

因为这里主语是 act
act后面有很多修饰语
act (of taking a medication) (that you think will make you better)
第一个括号里面是介词短语修饰,后面一个括号里面是从句修饰.
到了后面,often does make you feel better 的主语是 act