"To be" indicates a state of being or existence. It's an irregular verb with eight forms. It's the only verb with eight forms. Famous line from Shakespeare's "Hamlet"
There is no strict rule for verb form usage. Some verbs use -ing form (e.g. enjoy, mind, stop, recommend). Other verbs use infinitive form (e.g. decide, want, promise, forget). Some verbs can use either form with same meaning
Worksheet 1 focuses on subject pronouns and "to be" verb usage. Exercises include filling in blanks with pronouns and using "am/is/are". Worksheet 2 covers present simple and continuous tenses. Exercises include filling in blanks with present continuous and simple past
Participles are impersonal verb forms used as adjectives or in compound tenses. Present participle formed by adding -ing to verb infinitive. Past participle formed by adding -ed to regular verbs. Perfect participle combines present participle of have with past participle
Infinitives are verb forms starting with "to". Gerunds are verb forms ending in "-ing" used as nouns
Base form, past simple, and past participle are required