過去將來完成時的基本用法

在英語語法16多種時態中，過去將來完成時是用的相對較少的一種時態，它表示從過去觀點看將來某時某刻某個動作已經完成的一種狀態。通常主要用於轉述方面，即用於間接引語中。
過去將來完成時基本形式：should / would have done sth.例句：
1. I would have left the building before the murder took place.
在謀殺發生的時候，我就已經離開了這座樓。

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2. I thought you would have left by this time.
我想你這會兒已經走了。

3. I would have eaten the breakfast before my friends came in.
在我朋友進來的時候，我已經吃完早飯了。

4. I thought you would have done your homework as soon as possible.
我認爲你應該儘快完成作業。

5. I would have finished this project before my boss called me.
在老闆給我打電話的時候，我就已經完成了這個項目。

6. I thought you would have fed this litter cat.
我認爲你應該餵養這隻小貓。