I have been studying English for 3 years.He has been collecting the shells for 2 months.主语+have/has+been+动词的ing形式,表示过去开始,可持续到以后,现在一直都在进行的动作或状态.
I have been studying English for 3 years.He has been collecting the shells for 2 months.主语+have/has+been+动词的ing形式,表示过去开始,可持续到以后,现在一直都在进行的动作或状态.