在某教辅材料中遇到这样一句话:
Listening to English speeches and watching English movies are helpful to improve English.
我觉得这里的helpful后用不定式是错误,此错误就类似于我们不说We difficult to make progress而说It is difficult for us to make progress.
应该是helpful in improving...
请专家老师就此问题给予解惑。