Question

一个选择题（英语）

he has studied English _______________.
a. since two years ago
b. for two years.
答案是b 可是a 哪里错了？ 为什么?

Answer 1

A 时态不对。

首先，since two years ago意思是“从两年前开始(一直延续到现在)”，表示从过去某个时间开始一直持续到现在的动作，要用现在完成进行时。

举个例子：I have been living here since five monthes ago.
我从五个月前就开始在这住了。（现在仍然在这住）
I have lived here for five monthes.
我在这住了五个月。（什么时候在这住的，现在还住不住了都不知道）

所以要选A的话，应该是：
He has been studying English since two years ago.

Answer 2

A确实是错了，应该用完成进行时。
建议你去买《无敌英语》的高中版，它的第一章对时态的讲解非常到位。还有就是，时态题不能光理解，英语是一门语言，你必须要读和背，培养起敏锐的语感。背多了你就可以秒杀单选了。建议你去买《天星四十五套》，做完了之后把单选那部分减下来，随时都背，就没多少问题了。

Answer 3

since的四种用法

1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
I have been here since 1989.

2) since +一段时间+ ago
I have been here since five months ago.

3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.

4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.

完成时的句子也可以加for+一段时间表示在这段时间已近完成的动作

所以两句都没错

Answer 4

a不对！因为since是用在过去完成时have been doing sth，而has studied是用在have done（过去分词) sth现在完成时，我昨天才问的老师啊~~这类题我也曾经错了，现在完全明白了

Answer 5

since 和ago不能连用啊同学
可以说since 2years before，或者直接english 2 years ago