cost的过去式和过去分词

　　用法例句：

　　The cost should average out at about 6 per person.

　　费用应该是平均每人约6英镑。

　　We estimated it would cost about 5 000.

　　我们估计要花费大约5000欧元。

　　That one mistake almost cost him his life.

　　那一个差错几乎使他丧命。

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

　　我知道那花不了多少钱，但这不是重点。

　　It cost us nothing to go in.

　　我们没花钱就进去了。