是的過去式是什么

　　The system was state of the art.

　　這一系統是當時最先進的。

　　It was a time of peak demand for the product.

　　那是對該產品需求最旺的時期。

　　Much of the form was not applicable to me.

　　表格中很多部分不適用于我。

　　For a long time his death was concealed from her.

　　他的死瞞了很長時間都沒告訴她。

　　She was not only intelligent but also very musical.

　　她不僅聰明，而且極具音樂天分。