新概念英语第二册Lesson 5 No wrong numbers
英语世界 来源： 作者： 发布时间：2007-12-15
4、The bird covered the distance in three minutes.
cover the distance 飞过那段距离
5、Up to now, Mr.Scott has sent a great many requests for spare parts and other urgent messages from one garage to the other.
up to now =up till now 到目前为止，到现在为止(作时间状语，时态多用现在完成时，相当于until/till now)
Up to now, he has not been very hard-working.
request for 对……的需求
a great many(+可数名词复数) 许多……
a great many可以做形容词短语：
A great many trees were destroyed in the storm.
也可作代词短语：
He has read a great many of the books in this room.
a great number of(+可数名词复数) 许多……
urgent adj. 紧急的
something urgent 紧急的事情
【Key structures】
一般过去时与现在完成时
在表示过去某个特定时间发生的事情或动作时，要用一般过去时。在表示刚刚或者已经完成一个动作并且对现在有影响时，则要用现在完成时，时间状语可以是不特指的now，just或者for引导的一段时间，或者不加任何时间状语。
一般过去时与现在完成时的共同点：动作在过去都做过了；区别：过去式只能强调过去的事, 和现在没有任何关系.
I ate a piece of bread.
现在完成时, 强调过去的事情对现在产生的影响.
I have eaten a piece of bread this morning. I'm not hungry.
The clock stopped. 陈述事实
The clock has stopped. 过去的事实对现在造成影响
It snowed yesterday.
It has snowed yesterday. 强调对现在造成影响
