13．自從到了這個(gè)學(xué)校，他一直落后其他人．
Hehas been behind others since he came to this school．

分析 has been behind others．

解答 答案：has been behind others．結(jié)合since he came to this school可知?jiǎng)幼靼l(fā)生在過去，持續(xù)了一段時(shí)間，故用現(xiàn)在完成時(shí)have/has+過去分詞，be behind sb落后某人，主語he，故has，be的過去分詞been，故答案是has been behind others．

點(diǎn)評 現(xiàn)在完成時(shí)有兩種用法1．過去發(fā)生的某一動(dòng)作對現(xiàn)在造成的影響或結(jié)果或到現(xiàn)在為止已經(jīng)發(fā)生或完成的動(dòng)作．2．表示過去發(fā)生的、持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài)．

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