to buy后跟that是宾语从句吗

是宾语从句，例如：

1、I'm tempted to buy that hat.我忍不住想买那顶帽子。

2、They pinched and saved for many years to buy that house.他们多年省吃俭用买下了那幢房子。

3、Try to buy wood that you know has come from a sustainable source.尽量购买来自可持续发展林的木材。