Mike can you write kanji characters
dictionary_form + koto ga dekimasu
Maiku san wa kanji o kaku koto ga dekimasu ka? ( o kakemasu ka)
Can a human run 50km/h
potential form: hanashiremasu
Ningen wa jizoku 50 kiro de hanashiremasu ka?
I can speak Japanese
Nihon go (o hanasu koto) ga dekimasu
I cant read kanji
Kanji o hanasu koto ga dekimasen/ dekinai
Can you sky-dive?
Suukai daibingu ga dekimasu ka?