it也可代表抽象的事物
It was acclaimed as a great discovery.
它被誉为一次伟大的发现。
Will you pay cash or should I charge it to your account ?
您愿意付现金还是计入您的账？
Communication technologies are far from equal when it comes to conveying the truth.
交流的技术在传递事实时差别是很大的。

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“也”的区分：also, too, as well, either 
also比too正式一些，语气较重，只用于肯定句，一般紧靠动词。
too语气较轻，多用于口语，在肯定句中使用，通常位于句末。
as well一般不用否定句，通常放在句末强调时可放在句中。
either用于否定句，放在句末，之前加逗号
If he doesn’t go, I won’t go ______.
In this field he has knowledge and experience _______.
Simon likes playing football, and he ______ likes playing basketball.
He likes swimming, and his wife likes it, _______.

achieve one’s dream 意为“实现某人的梦想”。其主语必须是人。宾语通常是“dream, goal”等表示梦想，目标含义的词。其同义词短语为“realize one’s dream”和“make one’s dream come true”。
例如：I believe you will achieve/realize your dream one day.
= I believe you can make your dream come true one day.
[注意] come true意为“实现”，其主语是事物，如dream, goal等表示目标，梦想等含义的词。
例如：Finally, my dream of becoming a good teacher came true.
最终，我实现了成为一名优秀老师的梦想。

也可指动物或未知性别的婴儿
- Is this your dog ?
- No,it isn’t.
Her baby is due next month,she hopes it will be a boy.
她怀的孩子应该下月出生，她希望是个男孩儿。
The baby next door kept me awake,it cried all night.
隔壁的孩子整夜哭，吵得我睡不着。

单元中几个值得注意的词：
注重拼写pronunciation发音 （名词）--pronounce（动词）
◆Please tell me how to ____________(pronunciation) the word.
◆What’s the ____________(pronounce) of the word “text”?
兼类词 patience耐心（名词）---patient(1)有耐心的（形容词）(2)病人（名词）学习中主要区分
be patient with sb 对某人有耐心 be patient of 忍耐某事
The doctor should be patient with the patients.
医生应当对病人有耐心。
understand理解（动词）---understanding 认识，了解（名词）；宽容的，善解人意的（形容词）
increase增加；增多（可作及物与不及物）注重时态的应用。
active 积极的，有活力的（形容词）take an active part in积极参加……
connect连接---connect to / with…把……和……连接
音同词不同：whether是否；weather天气

It is often difficult to decide on the inventor of certain inventions.
解析：decide on sht. 就...作出决定
Decide on doing sth.  决定做某事
Decide to do sth. = make a decision to do sth. 决定做某事

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