重点讲解：
1. in case
（表示不耐烦地陈述显而易见或与听话人无关的事情）竟然，难道，假使；
eg. She's nervous about something, in case you didn't notice.
她正为了什么事神经紧张，你连这个都没看出来？
eg. 'I'm waiting for Mary Ann,' she said, 'in case you're wondering.'
“我在等玛丽·安，”她说，“要是你想知道的话。”
2. heads-up
警告；提醒；提前通知；
eg. That kind of early heads-up could help governments make more timely decisions.
这样的早期提醒可以帮助政府更及时的制定决策。
eg. The secretary gave my department a heads-up about tomorrow's inspection.
有关于明天的试查，秘书事先知会了我的部门。
3. do sb. a favor
恩惠；帮忙；
eg. I've come to ask you to do me a favour.
我来这儿是想请你帮个忙。
eg. Do me a favor by turning off that radio!
请帮我把收音机关掉！