sink的過去式和過去分詞怎么寫

　　The sun had already sunk below the horizon.

　　太陽已沉下地平線。

　　His voice had sunk to a conspiratorial whisper.

　　他的聲音降到密謀低語的程度。

　　Pay increases have sunk to around seven percent.

　　工資增長已下降到7％左右。