What are main verb tenses?
The main verb tense states the action of the subject. There can only be one main verb in the sentence, but the main verb can also be used with an auxiliary verb or a verb. The auxiliary verb and the modal verb must be used with a main verb tense.
The main verb tense is:
The main verb tense can be in its infinitive/basic form (simple past/v2), past participle/v3.
The main verb tense states what the action of the subject.
-ed -ing -s -es are some common endings that can be added to the main verb according to the tense.
It is common that the main verb doesn't change form, because the auxiliary words change form.
When using the continuous tense and the perfect verb tense auxiliary verb(s) are used with the main verb tense.
When an auxiliary verb is used the main verb doesn't change form according to the subject.
The main verb tense can change form when an auxiliary verb is used to according to the verb form.