I work overtime tonight ah 今晚我加班啊 ; 我今天晚上加班工作啊

I work overtime tonight 我今天晚上加班

Because I work overtime tonight 因为

I often work overtime 我经常加班

I voluntarily work overtime 我自愿加班

I volunteered to work overtime 我自愿加班

I Seldom Work Overtime 我很少加班

I Frequently Work Overtime 我经常加班