1. Ago 和before的区别

Ago – 和一般过去时连用

Before – 和完成时连用

The two drug ringleaders were executed two weeks ago.

They have done something wrong before.

2. E’conomy (n.) 经济

Eco’nomics (n.) 经济学

Eco’nomic (adj.) 经济的

Eco’nomical (adj.) 节约的 – economical car

3. 表语从句

Be 动词后面接从句

Death penalty is what these drug traffickers deserve.

Australia’s intervention (干涉) is why the Indonesian President accelerated the execution process.

Australian government’s reactions were too high-profiled, and this is why the Indonesian authorities had to carry out the executions.

4. 定语从句

Which, that, who, whom, whose, where, when, why (介词+which)

The food that I like the best is KFC.

The thing that I’d like to do …

The subject that I hate the most is accounting.

The reason that he gave was nonsense.

The reason why he was late was unknown.

5. 形式主语

It is no doubt that criminals need to face certain consequences.

澳大利亚政府决定从印尼召回大使(ambassador)是一个鲁莽（reckless）的行为。

It is a reckless decision that the Australian government withdraws its ambassador from Indonesia.

6. 同位语从句 (只能用that)

Tony Abbott made a reckless decision that Australia should recall its ambassador from Indonesia.（同位语从句）

Tony Abbott made a reckless decision that many people criticised. (定语从句)

7. 表示时间: when – 瞬间或者持续的时间；while – 只能是持续的时间

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