The window frames had begun to warp.
窗框已經開始變形。
He had begun to feel sleepy.
他已覺得困了。
The gold colouring had begun to rub off.
金黃色已經開始剝落了。
She had begun to be a little bored with novel writing.
她開始對寫小說有些厭倦了。
The blood had begun to cake and turn brown.
血開始結塊變黑。