How I understand it is that the subject marker 이/가 refers to a particular subject in conversation. Hence 'the' and not 'a'.
why can I not use a man walks together with a woman? Is it wrong because of the with or because together is on the wrong place? please help someone
synonymous here yeah, but its pretty important that you note 와/과/하고 on the first noun is explicitly "and", and 와/과/하고 on the second is explicitly "with", because there are places they arent interchangeable
How are "walking together" and "are walking together" different? This is just basic English...