Question

Tom has been in China for three years.(改为同义句)

1.Tom has been in China ( ) three years( ).
2.Three year ( ) ( ) ( ) Tom cane to China.
3.Tom ( ) ( ) China three years ( ).
4.It is ( ) ( ) ( ) Tom came to China.

Answer 1

保证正确！

1. since, ago
2. has passed since
three years等表示一段时间做句子主语时，视为整体，谓语动词必须使用单数形式。
3. came/went to, ago
4. three years since

注：/ 表示可以任意选用其一。

追问

since和ago可以连用吗，好像我们班的老师说不可以滴

追答

since做介词时，后面加某个时刻的单词/短语，所以加three years ago是绝对可以的，因为three years虽然是个时间段，但是three years ago却是个时刻/时间点。
而且可做如下转换：for + some time（一段时间） = since + some time（一段时间）+ ago
老师也会犯错误，当然我也是个英语老师，有时难免的，呵呵。

Answer 2

1.Tom has been in China (since ) three years(ago ).
2.Three years ( have ) ( passed ) ( since) Tom cane to China.你好，这里的year少了s哦
3.Tom ( came ) ( to ) China three years (ago ).
4.It is (three ) ( years) (since ) Tom came to China.
祝你学习进步O(∩_∩)O哈！

追问

第一题有了since还能用ago 吗？还有一题 It's five years since I taught maths 改为同义句
I ( )taught maths ()five years
I ()()()maths 5 years ago

追答

可以的哦
It's five years since I taught maths 改为同义句
I (have )taught maths (for)five years
I (began)(to)(teach)maths 5 years ago

Answer 3

1.Tom has been in China ( since) three years(ago ).
2.Three years ( have ) ( passed) (since ) Tom cane to China.
3.Tom ( came ) (to ) China three years ( ago).
4.It is ( three ) (years ) ( since ) Tom came to China.

追问

since和ago可以连用吗，好像我们班的老师说不可以滴

追答

我希望是你听错了，不然你们老师。。。
since 后加一时间点，而three years ago 就是，所以绝对没问题

Answer 4

你好 答案是 1题 since ago 2题has gone since3题came to ago 4题 third year since
谢谢

追问

since和ago可以连用吗，好像我们班的老师说不可以滴

Answer 5

1. since, ago
2. has passed since
3. came to ago
4. three years since