非人称代词it
It有时并不指具体东西，而指天气、时间、环境等，称为非人称代词
指天气
It was raining this morning.
今天早晨下雨了。
It was pouring with rain.
这时下着倾盆大雨。
It’s quite warm at the moment.
现在天气很暖和。
It’s stormy out at sea.
海上有风暴。

高中英语必修5单词

高中英语必修一听力

九年级上册英语听力

习语熟记：
Practice makes perfect.熟能生巧
Use it or lose it. 非用即失。
Knowledge comes from questioning.知识源自质疑。
It’s a piece of cake. 小菜一碟。
It serves you right.活该，自作自受。
The more , the better. 多多益善。
It’s never too old to learn. 活到老学到老。

So some people doubt whether the inventor came up with the idea himself or herself.
解析：come up with 意为“提出，想出”。相当于“think up”。

指时间
What day is it today ?
今天星期几？
It’s the third of June.
今天是六月三日。
It’s a long time since they left.
他们走了很久了。

Whether or not引导的主语从句和宾语从句。
whether or not you can do this well depends on your learning habits. 你是否能做好这件事取决于你的学习习惯。
此句中whether or not you can do it well是个从句，用作整个句子的主语。这种从句叫作“主语从句”
whether or not是英语从句的一个连词结构，意思和功能相当于whether, 表示“是否”，常出现在宾语从句，主语从句中。使用时，也可把whether和or not分开，or not放到句尾。 
例如:I can’t tell whether or not the teacher likes me. 
也可以写成: I can’t tell whether the teacher likes me or not.
主语从句做主语谓语也要用单数形式。所连接的句子要用陈述语序。

被动语态 (Passive Voice)
结构: be + V-p.p.
一般现在时的被动语态:
am / are / is +动词的过去分词
一般过去时的被动语态:
was / were +动词的过去分词 
例如:
Many  people  speak English. (主动语态)
English  is  spoken by many people. (被动语态)
The naughty boy broke the window yesterday. (主动语态)
The window was broken ( by the naughty boy) yesterday.
(被动语态)

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