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세종한국어1 2과 대화2 p.48

일하다[이라다][일하다]
전화하다[저놔하다][전화하다]

아요/어요
informal(casual) polite ending form
The words we studied like 하다, 일하다 ,공부하다, 운동하다..., they are infinitives. Of course, we have to use 아요/어요 ending form in conversation.
It's very basic, but very important grammar.

All the examples are made with 하다 verbs.
All 하다 verbs become 해요.
일하다: 일해요, 공부하다: 공부해요, 운동하다: 운동해요
:
Let me explain about how to make 아요/어요 form.
If the vowel in front of 다 is 아 or 오 + 아요
If the vowel in front of 다 is not 아 or 오 + 어요
하다 verbs are irregular 하다 becomes 해요.

가다 go : 가아요:가요
오다 come: 오아요: 와요 (오+아=와)

먹다 eat: 먹어요
기다리다 wait: 기다리어요 : 기다려요 (이+어=여)

*먹다, in this case, there is a consonant ㄱ between the vowels 어 , and the other 어 isn't omitted.

I already posted up a video about how to make 아요/어요, so check it out later, please.

타완 씨는 뭐 해요?
We call someone with his or her name, instead of you in polite situations. Try to start with the person's name, but if you don't know their name, just skip it. 뭐 해요? is okay, too.