The river is very deep here. (deep是形容词)
He pushed his stick deep into the mud. (deep是副词)
在一些固定的搭配中使用deep, 尤其在介词词组前。如：
be deep in debt 债台高筑
be deep in thought 深入沉思
do sth. deep into the night 一直做到深夜
deeply是deep后缀-ly构成副词, 使用时一般具有抽象含义，意为“深深地，深厚地，深切地”。如：
We are deeply grateful for your help. 我们非常感谢你的帮助。
4.fly away 与fly off
1）它们俩都可表示“匆匆离去（飞去）”之意，但有一些差别。fly away距离较远，而fly off指距离较近。
Then they flew away into their hiding place.
后来他们窜回到他们躲藏的地方去了。
When he was driving very fast, one of the wheels of his wagon flew off.
他正把车开得飞快，一只轮子突然脱落了。
2）away是副词，off既可作副词，也可作介词。off后可跟宾语，away后则不可。如：
The bird shook its tail and flew away. 那只鸟摇着尾巴飞走了。
【注意】把动词keep, run, walk, move等后面加上away或off, 其区别与上述所谈类似。如：
What kept you away last Sunday? 上星期日你为什么没来？
Keep off the grass! 勿踏草地！
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Unit 12 Mainly Revision教学目标