I am Thai and my English is still poor. But I love English and try to learn it every day.
May I try to say again about the confusion I am facing.
From: It looks nice.
someone tried to remind me that "It" is a third person singular, so it needs "s" after any verbs that work for for the subject (It).
But, from the sentence "It looks nice", As for my understanding, I think the sentense means " It (a subject) looks (verb) for something that must have an object. But I did not see any object here and "nice" is an adjective. I wonder why they did not say "It has been looked nice." (Passive voice that "It" being done something to it)
This is my long writing that I am not sure you can understand or not.
I don't mind if you don't want to continue trying to read and think about my confusion.