本课重点：过去进行时，一般过去时

　　一般过去时与现在完成时

　　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，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

　　【课文讲解】

　　all morning=all the morning

　　The plane was late 飞机晚(点)了

　　The bus was late./The train was late.

　　detectives 没有强调一些侦探或者那些侦探，强调侦探这种人

　　笼统感念，可不加some,the

　　....were waiting... 故事背景，用进行时态

　　They were expecting...期待着心理上的等

　　They were waiting for...

　　a valuable parcel of diamonds

　　a cup of tea 强调的是茶

　　South Africa 南非

　　a few hours earlier 几个小时以前

　　a few hours before/a few hours ago

　　someone had told...过去完成时，过去以前发生的事情

　　...that thieves would try to...

　　would+do 过去将来时,间接方式，转述，站在过去看未来

　　that 从句.典型的宾语从句，起转述作用

　　steal sth.

　　one...the other.../some...others...

　　others=other+名词复数

　　...the plane arrived,...were waiting inside the main building

　　while others were waiting on...

　　when; while 当……时候

　　while能用when代替;　但是when却不一定能用while代替.

　　while+从句，动作一定会延续

　　when+延续性动词/瞬间动词;when he arrived

　　when he died

　　when,while强调动作同时发生