Present Perfect Negative | English Grammar A2 Level
open.books4languages.com › english-a2-grammarWhen we use the present perfect in its negative form, we start with the subject, followed by have not and a past participle. In the third person singular, we use has not. NOTE: The past participle is usually used to form the perfect tenses, and it indicates past or completed actions. It is formed by adding -d or -ed to the base form of regular verbs, whereas irregular verbs have different fixed forms which need to be studied off by heart.