mabo初中现在完成时态讲解带练习

2021年1月13日发(作者：费雪)
一. 现在完成时的含义及用法
1. 现在完成时表示过去发生的动作,并对现在有影响。
2. 现在完成时表示从过去一直持续到现在的动作或状态。
现在完成时的基本句型：
肯定式：
主语 + 助动词have/has + 动词的过去分词.
否定式:
主语 + 助动词have/has + not + 动词的过去分词.
疑问式：
助动词Have/Has + 主语 + 动词的过去分词?
用法①现在完成时表示过去发生的动作,并对现在有影响。
Someone has broken the window. (窗户现在是坏的)
I have already lost the key. (我现在没有钥匙)
I haven’t read that book yet . (不了解书的内容)
I have just cleaned my hands. (手是干净的)
此时，现在完成时常与already(已经), yet(已经), just(刚刚),ever(曾经)等词连用，通常放在助
动词之后，过去分词之前。
already: 常用于肯定句中.
yet: 用于否定句，翻译为还没。疑问句尾.翻译为已经
1. 你已经找到你的书了吗?

2. 他们在这个城市建了许多房子.

3. Judy还没到达.

4. 你吃过早饭了吗?


用法②
现在完成时表示从过去一直持续到现在的动作或状态。
She has learned English for 5 years.
He has lived in Beijing since ( 自从)he was born .
Have you stayed here since ( 自从) 3 o’clock?
for+ 时间段
since+时间点 , since+ 句子
①Mr. Brown has had his TV _____15 years.
②I’ve taken driving lessons _______last month.
③My sister has had her cell phone _____a month .
④My friends haven’t visited me _______ my birthday.
⑤We haven’t used our car _____a long time .
⑥She hasn’t had a good cup of coffee ____ years.
⑦Tom has worn glasses _______he was 7 years old.