I think there is a difference. Sometimes, overlapping words are more suitable for chatting. Compared with "umm", the word "umm" seems a bit indifferent, which will make your chat partner feel that there is no desire to continue to chat.
I think there's a difference. Sometimes, stacking words is more suitable for chatting. Compared to the words "um," the word "uh" is a little aloof, it will make your chat subjects feel that they have no desire to continue talking.
I think there are differences. Sometimes, reduplication is more suitable for chatting. Compared with "mm-hmm", "mm", this word seems a little cold, which will make your chat object feel no desire to continue to talk.<br>