Past Tenses in English Contrasted
2. Signal words
* past participle:
- regular verbs → infinitive + –ed
- irregular verbs → 3rd column of the table of the irregular verbs
4.1. Affirmative sentences
4.2. Negative sentences
** Both the Present Perfect Simple and the Present Perfect Continuous are Present Tenses, but they also refer to the Past. That is why they are listed here.