Basics. Verb Forms: Be/Have/Do and Regular/Irregular Verbs.
Verb forms show tense, voice, mood, or other grammatical features, with regular and irregular verbs. Regular verbs follow a pattern by adding -ed for past simple and past participle forms. Irregular verbs have unique forms, including essential auxiliary verbs "be," "have," and "do." Examples of common irregular verbs are "go," "write," "sing," and "swim."
See a quick verb forms refresher inside!
Participle vs Gerund
Complex participles and gerunds, their perfect, passive or perfect-passive forms are interesting. The accurate understanding and usage of such participial nad gerund constructions especially after the verb to be and different prepositions; before nouns; and also in set expressions and constructions shows... shows...
Actually, go and try to figure it out yourself.