What is the difference between: 컴퓨터도 고쳐요 And 컴퓨터를 고치기도 해요 Purely hypothetical. I don’t actually fix computers. if you think of it simply it would be easier. The parts which have 도 are emphsised So the first sentence is emphasising on the object ," the computer" can also be fixed by me Second, it's emphasising on the fixing action that is related to fix computers. But if the sentences does not have the intention to emphasis on anything then you don't need to care about the difference between them as 도 is used just for adding examples 1. Emphasising cases "Object" 너 뭐 고칠 수 있어? 자전거, 냉장고, 컴퓨터 음... 시계도 고칠 수 있어 "Action" 너 저 닭으로 뭐할꺼야? 튀길 수도 있고 찔 수도 있도 볶을 수도 있고 내 맘이지 뭐 2. Just adding 너 뭐해 내일? 친구 볼 수도 있고 영화도 볼 수 있고 엄마랑 요리도 할 수 있고 심심하면 책도 읽을 수도 있고 정해진게 없어

컴퓨터도 고쳐요. I also fix computers. If I hear this I'd assume that this is in the context of someone saying they fix other things (e.g. phones) but that they also fix computers. It's a general statement. 컴퓨터를 고치기도 해요. This is quite similar to the above, but has the added connotation that this might happen occasionally. If you are translating this it's less of a general statement and more that the subject would also do this "at times."