Murga = Cock Murgi = hen

मुर्गा= male( cock) मुर्गी= female( Hen) Aata tha= came ( past participle come) - for male Aati thi= came ( past participle of come)- for female

gagan's answer is right. aata hai आता है - present simple 'comes'(subject is of masculine gender i.e. the one who comes, that word have masculine gender) aati hai आती है is for femenine 'comes' both mean 'comes', former for m and latter for f gender subject