重点讲解：
1. once upon a time
（常用于儿童故事的开头）从前，很久以前；
eg. Once upon a time in a faraway land there lived a princess in a big castle.
从前，在很远的地方，有一位美丽的公主住在一座很大的城堡里。
eg. Once upon a time, there were two merchants, who were friends.
从前，有两个大商人，他们是朋友。
2. be ready to do sth.
即将…的；可能…的；
eg. He seemed almost ready to cry himself.
他自己好像也要哭了。
eg. The potatoes are ready to be dug up.
快要收获土豆了。
3. take care of
照顾；照看；看护；
eg. Take care of yourself physically, mentally and emotionally.
在身体、精神和情绪上照顾好自己。
eg. I take care of them to the best of my abilities.
我尽我所能地照顾他们。
4. be able to do sth.
（因具有品质或技能）能做到…的；
eg. My son is able to dress himself.
我儿子都会自己穿衣服了。
eg. But I was able to control myself.
但我还能控制自己的脾气。