He thinks studying grammar is a great way to learn a language.为什么用study的动名词
问题描述：
He thinks studying grammar is a great way to learn a language.为什么用study的动名词
答
He thinks| studying grammar is a great way to learn a language.
竖线那里是宾语从句的开始.省略了that
studying grammar 是从句主语.不能用study grammar 做主语对不?所以用动名词做主语
比如：Learning English is interesting