重点讲解：
1. would
（通常用于疑问句中，表示礼貌地请求某人做某事）请；
eg. Would you do me a favour and get rid of this letter I've just received?
请帮个忙把我刚刚收到的这封信处理掉行吗？
eg. Would you come in here a moment, please?
请进来一下好吗？
eg. Would you excuse us for a minute, Cassandra?
卡桑德拉，我们出去一会儿你不介意吧？
2. have to
需要；必须；不得不；
eg. He had to go to Germany.
他不得不去德国。
eg. You have to be careful what you say on telly.
在电视上说话时你必须很谨慎。
eg. They didn't have to pay tax.
他们不必交税。
3. It's hard to do sth.
常用句型，表示做某事很困难；
eg. It's hard to tell what effect this latest move will have.
很难说最近这次行动会有什么结果。
eg. She found it hard to accept some of the criticisms directed towards her and her work.
她发现某些针对自己和自己工作的批评意见很难接受。