This is because in the early days of radio, those who reported the news were expected to speak excellent English.
固定用法：this is because...这是因为。。。
Be expected to do sth: 被期望做啥事
expectation: 期望
However, on TV and the radio, you will hear differences in the way people speak.
E.g. I don’t like the way (that) he speaks.
Geography also plays a part in making dialects. 地理位置也对方言产生影响。
play a (adj) part in:在。。。。。。扮演角色，起作用。
E.g. English plays an important part in daily life.
Although many Americans move a lot, they still recognize and understand each other’s dialects.
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现在完成进行时
表示从过去某一个时间开始一直延续要现在的动作， 这个动作可能刚刚结束，或者可能要继续进行下去。 She has been working in Guangzhou since 1985 。
过去完成进行时
表示过去某个时间以前已经开始而又延续到过去这个时间的动作。 可能刚刚停止，也可能还在继续。 He told me that he had been a teacher of physics for more than twenty years 。
在表示时间或条件关系的主从复合句中，遵照“主将从现”原则，主句用将来时态，从句用现在时态。
被动语态
助动词be + 及物动词的过去分词
含有情态动词：情态动词+ be + 及物动词的过去分辞
短语动词 ：example takes good care >> taken good care
虚拟语气
用来表示非真实的假设，表示命令、建议或说话人的主观愿望
条件从句 主句
违背现在事实 过去式 should / would / could / might + 动词原形
although: 连词，连接句子的并列连词，表转折,虽然，不可以和but连用。
move: 移动，搬家，感动
recognize:识别，认出，词性转换——recognition n.
dialects: 方言
Well, go around the corner on your left-hand side, straight on and cross two streets.
哦，在拐角处左拐，向前直走，穿过两条街道。
go around: 走动
corner: 拐角处
On one’s side:在某某一边
straight:adj/adv. 径直地，直接地，直接的。
If the manager were here , he might make a decision immediately
违背过去事实 had + 过去分词 should / would / could / might + have + 过去分词
I could have done it better if I had been more careful
违背将来事实 should + 动词原形 should / would / could / might + 动词原形
were + 动词不定式( were to + 动词原形)
If it should rain tomorrow , what could we do ?
在下列结构的主语从句中，谓语动词用虚拟语气
A common memory they all have________their school days is the school uniform.A. of B. on C. to D. with
【答案】A
Human life is regarded as part of nature and, as such, the only way for us to survive is to live ________ nature.A. in view of B. in need of C.in touch with D. in harmony with
