作为副词来讲，deep和deeply都有“深深地，深切地”的意思。

但deep常用来表示具体的深度，如：sink deep、dig deep、study deep into the night、study deep into the subject 等。

而deeply常用于引喻的场合，有时等于“非常地”的意思。

扩展资料

当修饰动作时，deep和deeply都可以用，但deep更为常用。形容静止状态时只用deep，不用deeply。

修饰形容词只用deeply，不用deep。

在被动结构中，deeply 常用于过去分词之前；deep 常用于过去分词之后。

deep的例句：

Like many women, deep down she was unsure of herself.

和许多女性一样，她心底里缺乏自信。

A deep mutual respect and understanding developed between them.

他们之间产生了深切的相互尊重和理解。

He has a deep distrust of all modern technology.

他对所有现代技术都深表怀疑。

deeply的例句：

She was deeply involved with the local hospital.

她曾全心投入当地医院。

I didn't realize but he was deeply unhappy at that time.

我没有察觉到原来他那时非常不开心。

The President is deeply concerned about this issue.

总统对这个问题深感担忧。