Je was op zoek naar: it's customary and customary (Engels - Tagalog)

accustomed and customary to do
nakasanayan at nakaugalian na gawin

i know it's been a while since you've been to my class, but it's customary to let your scene partner respond at some point.
alam kong matagal ka nang hindi pumapasok sa klase ko. pero dapat pasalitain mo naman ang partner mo