11 ask sb for sth 向某人什么
12 ask sb to do sth 询问某人某事 ask sb not to do 叫某人不要做某事
13 at the age of 在……岁时 eg：I am sixteen I am at the age of sixteen
14 at the beginning of …… ……的起初;……的开始
15 at the end of +地点/+时间 最后;尽头;末尾 eg ： At the end of the day
16 at this time of year 在每年的这个时候
17 be /feel confident of sth /that clause +从句 感觉/对什么有信心，自信
eg ： I am / feel confident of my spoken English I feel that I can pass the test
18 be + doing 表：1 现在进行时 2 将来时
19 be able to (+ v 原) = can (+ v 原) 能够…… eg ： She is able to sing She can sing
20 be able to do sth 能够干什么 eg ：she is able to sing