Breakdown of Я смотрю на его визитку.
я
I
на
on, at / by (transport) / to (a place) / to (in answer to)
смотреть
to watch / to look at / make sure (in a warning)
его
his / its (possessive)
Questions & Answers about Я смотрю на его визитку.
Why didn't его change its ending to match the accusative case of визитку?
The word его (his) is a 3rd person possessive pronoun, along with её (her) and их (their). These specific pronouns are completely indeclinable. Unlike words like мой (my) or твой (your), which must change to match the noun's gender, number, and case, его always stays exactly the same.
Why is визитку in the accusative case instead of prepositional after на?
The verb смотреть (to look) paired with на requires the accusative case because it indicates the direction of your gaze (looking at a target). The dictionary form is визитка, a feminine noun, so its ending changes to -у. If you used the prepositional case (на визитке), it would bizarrely imply that you are physically standing on top of the business card while looking!
Is визитка the formal word for a business card?
Визитка is actually the standard, everyday word for it. It is technically a shortened version of the more formal phrase визитная карточка, but Russian speakers almost always use the single word визитка in normal conversation.
How do I pronounce его here?
It is pronounced as ево (yevo). The letter г is pronounced like a v in the genitive and accusative masculine/neuter endings (-ого / -его) and in the standalone word его.