英语----时态---将来时态的

I've been ringing her for 10 minutes.

I'm exhausted. i've been painting the bookcase all day.

Don't disturb me. I've been writting letters for three hours.

I have written a letter. // 以及完成     已经写完

I've been writing a letter. // 还在写   强调动作

I have cleaned my room.

I have been cleaning my room all morning.

the phone have ringing for a long time, 

A: you look tired.

B:i have writen my papers.

他一直翻译那些书到2012年

她在7点回来，他一直等了他两个小时

She came back at seven. He had been waiting for her two hours.

// 过去完成有一个时间点

Up to 2012 he had translating those books.

//