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goodbye - da svidaniya or paka. You can also say tseluyu (I kiss you) when saying goodbye.
I love you - ya lyublyu tebya

if you are not joking :? ...
tell her that <nada skhadit' v tualet pa balshomu> or <nada pakakat'> and <ne slivat' vodu> (not to wash it down) because <nada sdat' analizy> (take samples to the...

stop hitting: Не дерись! Ne deris' Перестань драться perestan' dratsa
don't spit: Не надо плеваться ne nada plevatsa
don't kick: не надо пинаться ne nada pinatsa, нельзя пинаться nel'z'a pinatsa...