The window frames had begun to warp.

　　窗框已經(jīng)開(kāi)始變形。

　　He had begun to feel sleepy.

　　他已覺(jué)得困了。

　　The gold colouring had begun to rub off.

　　金黃色已經(jīng)開(kāi)始剝落了。

　　She had begun to be a little bored with novel writing.

　　她開(kāi)始對寫(xiě)小說(shuō)有些厭倦了。

　　The blood had begun to cake and turn brown.

　　血開(kāi)始結塊變黑。