Answer: B) Helping verb.
Explanation for this question is being written.
Answer: A) Can
Answer: C) Couldn't
Answer: B) Can
Answer: B) Can't
Answer: C) Can
Answer: B) Modal verb.
Answer: D) Can't
Answer: C) I can swim.
Answer: C) Modal (Auxiliary verbs).
Answer: A) When I was younger, I could run fast.
Answer: D) Be able to.
Answer: B) Cannot
Answer: C) Subject (pronoun or noun) + can't + verb + complement.
Answer: D) COULD
Answer: B) Could
Answer: A) Could / can.
Answer: A) Could ask.
Answer: A) Could you.
Answer: B) Incorrect
Answer: C) Be able to.
Answer: C) Couldn't you wait a few minutes?
Answer: D) Can / must.
Answer: A) Can't
Answer: A) Ability
Answer: A) No, they can't.
Answer: C) Could
Answer: D) Can't, can.
Answer: C) My grandfather could work on the field all day without eating.
Answer: D) Yes, 'could' can indicate past ability.
Answer: A) Couldn't
Answer: A) Could
Answer: D) Can
Answer: A) CAN'T