We began to study hear 2 year ago.改为同义句 用since或for转化为现在完成时的句子

问题描述:

We began to study hear 2 year ago.改为同义句 用since或for转化为现在完成时的句子

两种转化方式:
用since转化:We have begun to study since 2 years ago.
用for转化:We have studied for 2 years.