Nihongo wa konnan na desu.→Nihongo wa konnan desu.

dakara dayo nihongo no gakushuu.→dakara nihongo wo gakushu shimasu.

watashi wa 7 tsuki irai, nihongo o benkyou shite iru,→watashi wa 7gastu irai(form June?),

nihongo wo benkyou shite imasu.

Nihongo wa totemo konnan na desuyo, tokuni kanji.→Mihongo wa totemo konnan desu,tokuni kanji ga.