2017中考英語語法復(fù)習：現(xiàn)在完成進行時

8.現(xiàn)在完成進行時
    概念: 表示從過去某一時間開始持續(xù)到現(xiàn)在的動作.這一動作可能是剛剛開始,也可能仍在繼續(xù),并可能延續(xù)到將來.
    構(gòu)成: 主語 + 助動詞 (have / has ) + been + 動詞-ing +…
    如: 1. I have been sitting here for an hour.
    2. She has been collecting stamps for about 6 years.