定语从句:Most of the people who was invited to the party were his old friends. 后置定语:Most of the people invited to the party were his old friends. 这两种说法都是正确的。
定语从句:The line chart describes the different amount of water that/whih was used in three aspects of life. 后置定语: The line chart describes the different amount of water used in three aspects of life. 这两种说法都是正确的。