Verbs and Tenses: Simple, Continuous and Perfect

Simple tenses: present (she walks), past (she walked), future (she will walk). Continuous: am/is/are + -ing (she is walking), was/were + -ing. Perfect: has/have + past participle (she has walked), had + past participle (she had walked). Irregular verbs: go - went - gone; eat - ate - eaten; write - wrote - written.