have + been +現在分詞，構成完成進行時。例如：
I have been studying English for ten years. 我一直在學英語，已達十年之久。
have +been +過去分詞，構成完成式被動語態。例如：
English has been taught in China for many years. 中國教英語已經多年。
do 的用法
構成一般疑問句。例如：
Do you want to pass the CET? 你想通過大學英語測試嗎？
Did you study German? 你們學過德語嗎？
do + not 構成否定句。例如：
I do not want to be criticized. 我不想挨批評。
He doesn't like to study. 他不想學習。
n the past, many students did not know the importance of English.
過去，好多學生不知道英語的重要性。