The best way to learn English is by watching English language movies

问题描述:

The best way to learn English is by watching English language movies
我知道可以说is to watch那可不可以说The best way to learn English is watching English language movies.

可以,其实这里不用加by,按你说的The best way to learn English is watching English language movies就是对的.
is后面的doing sth.作名词.