English Grammar DO/DOES/DID -- Verb 'Do is used as an AUXILIARY VERB as well as an MAIN (ORDINARY) VERB | MAIN VERB: When used as main verb, verb do is followed by an object. | AUXILIARY VERB: When used as an auxiliary verb, it forms the perfect and perfect continuous tenses. [Note: Auxiliary verb is a verb which is used with main verb to show tenses, etc.] | He does not do these kinds of things. [In this sentence, Does has been used as Auxiliary Verb, while Do has been used as Main Verb] |They do not do nation-building. [In this sentence, Do has been used as both Auxiliary Verb and Main Verb] | Note: Verb do has the following forms: Present form Do or Does; Past form Did; Past Participle form Done | Main Verb Do may denote the following actions to find the answer to something: - Can they do this puzzle? to perform an activity or a task: - I do work till late night. to produce something: - He did a painting last night. to study something: - I am doing English these days. to talk about household chores (cleaning, washing, etc.): - They will have to do (wash) dishes. to work at something as a job: - What do you do for your livelihood? | Main Verb Do is also used to show the following actions: to attend, to cook, to copy somebodys behavior, to travel, to visit somewhere as a tourist, to cheat, to punish, to steal, etc. | DONE - PAST PARTICIPLE OF TO DO -- Past participles are accompanied by TO HAVE or TO BE (in the correct tense): He has done an obligation to me. You have done your country proud. This type of job is done in this factory. Work was done according to the rules.