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o have read the book 。(to have read發(fā)生在seems所表示的時(shí)間之前) The battery appears to have run 。(to have run down發(fā)生在appears所表示的時(shí)間之前) 但在下面句子中,動(dòng)詞不定式表示“動(dòng)作沒有完成”: We were to have met at ,考研英語《考研英語:語法大全(動(dòng)詞不定式語態(tài)用法)》。(結(jié)果未見面) 動(dòng)詞不定式進(jìn)行式的用法 動(dòng)詞不定式進(jìn)行式表示動(dòng)作正在進(jìn)行,與謂語動(dòng)詞表示的動(dòng)作同時(shí)發(fā)生。如: He see