roof的复数形式怎么写

　　例句：

　　The house needs attention but the roof is sound.

　　房子需要修葺，不过屋顶还完好无损。

　　We could see the stars through an opening in the roof.

　　我们从屋顶的小洞能看见星星。

　　I don't want her under my roof again.

　　我再也不想让她到我家来了。

　　There are various stores and restaurants all under one roof.

　　在同一栋大楼里有各种商店和饭馆。

　　I'll have to see about getting that roof repaired.

　　我得找人把房顶修一修。