"I like your watch."
Translation:Eu gosto do seu relógio.
2020 Sorry Amy76582 but the answer to your question would take too long, as there are lots of different occasions!
However in an example of the translation wanted here, when saying that you (first person singular) like - and then say what (noun) you like - it has to be followed by a "de".
Eg. "Eu gosto de o meu gato", BUT we cannot put "de o", we always have to contract it to "do". Another example would be:
"eu gosto da sua luva" again the "de a" has to be contracted to "da".
So, so far I have said
"I like my cat" with both the "o" and" meu" being used, because "gato/cat" is masculine (a gata, being a female cat)
My other phrase was
"I like your glove", and as "glove" is feminine, I used "a sua"
Ok, one more example, I want to say
"I like her cat"
so I would say
"eu gosto do gato dela"
which literally means
"I like the (male) cat of her",
which in English, we would translate as "I like her cat". I really hope that my attempt at explaining is both correct and understandable!