feel good about oneself change one's mind waste one's time 的同义句

1.feel good about oneself
= be/feel pleased/happy/satisfied/content/nice with oneself
对自己感到满意/自感良好
2.change one's mind
= change one's idea
改变某人的主意/想法
3.waste one's time
= spend one's time
这个在中学阶段没有特别好的同义短语,spend one's time勉强可以,后面都可以接on sth或(iin) doing sth.