英语难题!I have been learning English for two years =It is years ( )I ( ) to learn EnglishMr Green came to China over ten years ago =Mr Green ( ) ( ) ( )China for over ten years = ( ) ( )over ten years ( ) Mr Green came to China =Over ten years( ) ( ) ( ) Mr Green came to China

I have been learning English for two years
=It is two years (since )I (began) to learn English
这里缺少two，我加上了。
Mr Green came to China over ten years ago
=Mr Green (has ) (been ) (in )China for over ten years
= (It ) (is )over ten years (since ) Mr Green came to China
=Over ten years(has ) (passed ) (since ) Mr Green came to China
这几题有相同之处，主要考察since及现在完成时的用法，特别是“it is。。。+一段时间+since+一般过去时”句型

1.Since, began
2.has been in
It is,since
has passed since

I have been learning English for two years
=It is years (ago)I (start) to learn English
is后边是不是少个two?
Mr Green came to China over ten years ago
=Mr Green (have) (been) (in)China for over ten years
= (It) (is)over ten years (since) Mr Green came to China
=Over ten years(has) (passed) (since) Mr Green came to China

Mr Green came to China over ten years ago
=Mr Green (HAS ) (BEEN ) ( IN)China for over ten years
= (It) (is )over ten years (since ) Mr Green came to China