shovel的過去式怎么變化

　　例句：

　　A shovel was leaning against the wall.

　　一把鐵鏟靠墻放著。

　　They went out in freezing conditions to shovel snow.

　　他們冒著嚴寒出去鏟雪。

　　The children took their pails and shovels to the beach.

　　孩子們帶著桶和鏟子到海灘上去了。