1.something that is of very good value

非常有价值的东西 be of very good value属于"be of＋名词"结构，相当于形容词用法。 His opinion is considered to be_of_great_use.

大家一致认为他的观点很有用。 2.If so, it is time for you to think again.

若真这样想的话，现在到了你重新考虑的时候了。 if so是省略句式，意为"如果这样的话"，so代替上文的内容。 Will you be free this Sunday? If_so，let's go camping!

这个周末你有空吗？如果有，我们去野营吧！ 3.In fact, it is you who have the most important role to play in stopping Yellow River erosion.

事实上，你才是阻止黄河水土流失最重要的人。 "It's ... that/who "构成强调句型。 It_was_not_until she took off her dark glasses that I realized she was a famous film star.

直到她摘下墨镜我才意识到她是个著名的电影明星。 　　

　　1．(教材P10)Which of the following do most British people bargain for?

　　下面哪一项是大多数英国人最易讨价还价的？

　　bargain vi.讨价还价；讲条件n.便宜货；协议；交易

　　(1)bargain with sb. about/over/for sth. 和某人就某事讨价还价

　　(2)make a bargain with sb. 和某人达成协议

　　It's/That's a (real) bargain. 这(真)是个便宜货。

　　①We've made a bargain that he'll do the shopping and I'll cook.

　　我们已经讲好了，他买东西我做饭。

　　②I bargained with her about/over the price of the second­hand bike.

　　我跟她就这辆二手自行车讨价还价。

　　③This house is a_real_bargain,_but its position isn't quite good.

　　这套房子确实便宜，就是位置不太好。

　　2．(教材P10)She is not ashamed to say she has not got much money.

　　她没有很多钱，她对此并不感到惭愧。

　　ashamed adj.惭愧的，羞耻的；害臊的

　　be ashamed of (doing) sth.　 对(做)某事感到惭愧

　　be ashamed to do sth. 以做某事为耻；羞于做某事

be ashamed that ... 对......感到惭愧