pammi is rocking on hello English :d

Are you from India?

tum aaj kya kr rhe ho? aaj tum kya kr rhe ho? fir aaj ka kya plan hai?

verb matlab kriya khelna, dance krna, bat krna, likhna, sona, rona... jo bhi kam insan dwara kiya jata hai wo verb m aata h example ramesh nach rha hai (nachna) ramesh is dancing sonu so rha h. (sona) sonu is sleeping.

kya hua... example what happened ramesh, why are you so sad? kyu hua ramesh tum inte dukhi kyu ho?

Both are incorrect. 2nd one has only one mistake. he reached at the airport. or if he just landed then .. he arrived at the airport. was is mostly used with onging task in past (past continues ) like- rahul was going to school. the sentence you picked is past indefinite. you should study tenses to clear your doubts.