Short-form Answer to Questions with Adverb of Frequency
It's said that the adverbs of frequency should be placed before Be verb or helping verb when occurring in the short-form answer. However, these negative answers don't seem right to me. Therefore, I would like to know whether or not the following short-form answers are grammatically correct. If not, please show me the right answer. Thank you in advance.
Q1. Do you always go to school by bus? => No, I always don't.
Q2. Do you usually go to school early? => No, I usually don't.
Q3. Is your sister often late for school? => No, she often isn't.
Q4. Do you sometimes go to a movie on weekends? => No, I sometimes don't.