请问I didn't see him和I haven't see him的区别

请问I didn't see him和I haven't see him的区别 you didn't see him and____did i I ____(see)him,but he didn't see me I didn't see him yesterday afternoon,He ------have attended I didn't see him __ a year. didn't see him yesterday I didn't see him,but i _____(hear)him ____(go)downstairs i can't say___i want to see him again.we haven't seen each o 用动词的适当形式 I didn't see him yestoday.He ___(must,be )ill. I haven't seen (not ,see)him since i came here i didn't see I will never see him again和I would never see him again的区别?