I saw countless youtube videos and grammar books but -ing is too hard.
losing weight
gaining weight
are "losing" and "gaining" gerund or adjective?
I saw countless youtube videos and grammar books but -ing is too hard.
losing weight
gaining weight
are "losing" and "gaining" gerund or adjective?
In theory, both. Gerunds are verbal forms that function as nouns: in this sense, gaining weight has roughly the same meaning as process where one gains weight, with weight being the object of the verb.
However, they could also be adjectives, modifying weight: the weight that is gaining. This doesn't make sense for this particular choice of words (which is why I start my answer with "in theory"); but if we take another example: