for when you want to express that you are scared of something or someone,

当你想表达你对某事或某人很恐惧的时候，你就可以使用这个句型。

I'm afraid of 课堂 - SpeakingMax英语口语达人

I think you'll like using the pattern "you look" to express how you feel about someone.

我想你会喜欢用“you look”这个句型来表达你对某人的感觉。

You look 课堂 - SpeakingMax英语口语达人