EasyPRORegular Verbs: -edwalk→walked, stop→stopped, study→studied. Spelling rules for -ed.SpellingUnlock PRO
MediumPROIrregular Verbsgo→went, see→saw, have→had. The 60 most essential irregular forms.VocabularyUnlock PRO
MediumPROdid / didn't / Did I?Master the auxiliary verb 'did' — negatives and questions.AuxiliaryUnlock PRO
HardPROPast Simple vs ContinuousCompleted actions vs actions in progress at a past moment.ComparisonUnlock PRO