… you have probably been learning independently， actively， and purposefully.

　　句中所用的時態(tài)為現(xiàn)在完成進行時，表示一個動作從過去的某一時間開始，一直延續(xù)到現(xiàn)在，可能還要繼續(xù)下去。又如：

　　1) He has been working for a whole day.

　　2) They have been watching TV for two hours.

　　請翻譯下面的句子：

　　1) 老李已經在南京生活了二十年。(Lao Li has been living in Nanjing for 20 years.)

　　2) 雨下多久了?(How long has it been raining?)

　　3) 我等了他一個多小時了。(I have been waiting for him for more than an hour.)