were made是什么时态

　　The changes were made with surprisingly little difficulty.

　　这些变化几乎没有遇到阻力，简直不可思议。

　　Two substitutions were made during the game.

　　比赛中换了两次人。

　　The ship went down although strenuous efforts were made to save it.

　　尽管人们为营救这条船做了很大的努力，它还是沉了。

　　The holes in the cloth were made by moths.

　　布上的窟窿是虫子蛀的。

　　The gates were made of wrought iron.

　　这些大门是用熟铁制成的。