Not quite. We'd say it differently. I used to believe in Santa Clause, but I've grown up since then.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
whatchadoinIs "I grew up since then" totally wrong?In my opinion, yes.
whatchadoinDo native speakers always use present perfect with since?I can't answer a question that contains "always", but I would say that "most of the time" sounds reasonable.
whatchadoinWhy did the speaker say "grew up"?