to|buy後跟that是賓語從句嗎

是賓語從句，例如：

1、I'm tempted to buy that hat.我忍不住想買那頂帽子。

2、They pinched and saved for many years to buy that house.他們多年省吃儉用買下了那幢房子。

3、Try to buy wood that you know has come from a sustainable source.儘量購買來自可持續發展林的木材。