in romaji, MMM said:
For unvariable adjectives
convenient: benri desu
not convenient: benri janai desu
was convenient: benri deshita
was not convenient: benri janakatta desu or benri ja arimasen deshita
All of this in polite form
I must thank MMM, I did two years of japanese by myself, had to stop due to exams in my job that I try to pass since two years and these forms (with sha) weren't in my different learning books. So I learnt too tonight!
And thanks to Nathan to have corrected me, I lost my eyes and didn't see the tenten on up right of "shi" so I wrote first "sha" or "shanai"!
Demo, watashi wa mekura janai desu!
