In lesson 4.2, the first sentence of the conversation is:
すみません、さやか さん。なに を よんで (い)る ん です か?
すみません、さやかさん。何を読んで(い)るんですか?
Excuse me, Sayaka, what are you reading?
Why is there a pair of parentheses around the い in いる?
Why is there a pair of parentheses around the い in いる?