单词
pigeon n. 鸽子
- Dove
message n. 信息 - send a message
- receive / get a message
- leave a message
- an urgent message
- short message service = SMS
- information n. [u]
distance n. 距离 distant adj. 遥远的
- difference n. 不同，差异 different adj. 不同的
- importance n. 重要 important adj. 重要的
- confidence n. 信心 confident adj. 有信心的
- convenience n. 方便 convenient adj. 方便的
request n. 要求，请求 - Their request is absurd.
- We will refuse the request.
spare part 备件 - spare time
语法
现在完成时 vs 一般过去时
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
形式：have/has+done
用法：现在的之前
- He has left.(现在全部完成)
- We have learned English for ten years.(现在部分完成)
变否定疑问:
He has left.
He has not left.
Has he left?
补充：现在完成时与一般过去时的区别
如果强调过去的事情，我们就用过去时。
如果对过去做的事情对现在有影响就用现在过去时。如果有明确的过去时间yesterday，就一定要用一般过去时。
He has left.
现在全部完成可以换成 一般过去时
- He has left,so I cannot find him now.
- He left two hours ago.
补充：现在完成时与一般过去时的区别
We have learned English for ten years.
现在部分完成不能换成 一般过去时
We learned English for ten years. ×
Mr. James Scott has a garage ... and now he has just bought another garage ...
-
现在完成时
-
have/has + just(already、ever、never、) + done
-
现在完成时，肯定 “已经”
have/has already done
He has already had his breakfast. -
否定 “还没有”
have/has not done yet
He has not had his breakfast yet.
...so he has just bought twelve pigeons.
- 现在完成时
Yesterday, a pigeon carried the first message from ... to ...
一般过去时
Up to now, Mr. Scott has sent a great many requests ... and another urgent
messages from one garage to the other.
- up to now = up till now
- So far
- one ... the other
- some ... others
In this way, he has begun his own private “telephone” service.
- begin began begun
- one’s own + n
拓展
现在完成时
have / has + done
现在的之前
- Up to now, the program has saved thousands of children who would otherwise have died.
- For many years, people have dreamed of electric cars. However, making them has been more difficult than
predicted.
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