cost的過去式和過去分詞

　　用法例句：

　　The cost should average out at about  6 per person.

　　費用應該是平均每人約6英鎊。

　　We estimated it would cost about  5 000.

　　我們估計要花費大約5000歐元。

　　That one mistake almost cost him his life.

　　那一個差錯幾乎使他喪命。

　　I know it won't cost very much but that's not the point.

　　我知道那花不了多少錢，但這不是重點。

　　It cost us nothing to go in.

　　我們沒花錢就進去了。