having done
叫動(dòng)名詞的完成式,相當(dāng)于過(guò)去完成時(shí),是非謂語(yǔ)的一種,你的例句應(yīng)該后面還有一個(gè)過(guò)去式的句子,表示,having spent some time in the city,在你后面的動(dòng)作之前就發(fā)生了過(guò)去的過(guò)去以前，就用動(dòng)名詞的完成形式是吧？還要看邏輯主語(yǔ)和非謂語(yǔ)動(dòng)詞是不是主謂關(guān)系舉個(gè)例子可以不？having spent the whole morning, i went home with an empty bag沒(méi)有連詞，謂語(yǔ)動(dòng)詞是went,spent要處理成非謂語(yǔ)，i 和spend是主謂關(guān)系，本應(yīng)該用spending ,但是，又是過(guò)去的過(guò)去，就用 having spent=i had spent the whole morning before i went home...=having spent he whole morning ,i went home with an empty bag