14. present perfect simple ① Form affirmative I / You / We / They have ('ve) finished. He / She / It has ('s) negative I / You / We / They have not finished. He / She / It has not questions Have I / you / we / they finished? Has he / she / it short answers Yes, I have. / No, I haven't Yes, we / they have. No, we / they haven't. Yes, he / she / it has. No, he / she / it hasn't. ② Use * The t..