It's very easy to use. But something you really should master.

这个句型很容易就能学会，这也是你必须得掌握的一个句型。

When 课堂 - SpeakingMax英语口语达人

The "Is there" pattern is a great one to master. because it's so easy.

Is there”句型是一个应该掌握的很棒句型。因为轻而易举就能学会它。

Is there 课堂 - SpeakingMax英语口语达人