单词讲解

cause
v.引起 Carelesses causes accidents.
粗心会引起事故
n. 起因 the cause of the fire
examine v.检查
examner n.主考官
examination n.检查考试(exam)
accidentlly adv.意外地,偶然地
do sth. ccidently
do sth. by accident
do sth. by chance
accident n.
accidental adj.
remains n.残骸
remain v.保持,保留
remain silent
wire n.电线
wireless adj.无线的
wireless network / mouse / keyboard
solve v.解决
solve the mystery
solve the problem of…
solve the problem of air pollution / earthquake

语法讲解

Key points
现在完成时

形式 : have / has + done
用法 :
现在全部完成
现在部分完成

现在完成时
He has left.
现在全部完成
We have learned English for ten years.
现在部分完成
We have been learning English for ten years.

He has been waiting for three hours.
现在完成进行时
have / has + been doing
“现在的之前 + 进行”

现在完成进行时

Alicia has planed(has been planing) to go to Egypt for 2 years,and she is still on it.
Alicia has planed to go to Egypt for 2 years,but she gives up.

At last firemen have put out a big forest fire in California.
现在完成时
Since then,they have been trying to find out…
现在完成进行时
… they have been trying to find out how the fire began.宾语从句
Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away.
forest fires
cigarette ends 名词变复数,后变前不变
He noticed the remains of a snake which was would round the electirc wires of a 16,000-volt power line.
看从句 : 往前看 : snake
定语从句 / 同位语从句
修饰限定n. / 解析说明
任意名词后 / 抽象名词后

… he became the … owner of a bed which had springs.

现在完成时
have / has + done
现在的之前

现在完成进行时
have / has + been doing
现在的之前 + 进行

我们学习英语十年了.
We have been learning English for 10 years.

她现在已经吃了2个小时了还在吃.
She has been eating for 2 hours.

他们现在已经在这个项目上工作了好几个星期,还没完.
They have been working on the project for weeks.

我已经等了你好长时间.
I have been waiting for you for ages.