封建思想的表现有哪些:I should have keep my room clean.为什么要加have啊？？

I should have keep my room clean.为什么加have?? I should have keep my room clean.为什么加have?? I should have keep my room clean.为什么加have?? I should have keep my room clean.为什么要加have 啊？ I should have keep my room clean.为什么要加have啊？？ quite as good as i should have 请问I guess I should have written it sooner.是什么意思？是不是虚拟语气？ I'm sorry, I have forgotten your name. I'm sorry, I have forgotten your name. you should have studied