Perfect tense ( or preterite ) the third person plural of the verb be. A key role of it is as auxiliary ( other verbs: "I understood" ). Proper use is when expressed convenience, need or obligation; equivalent to ' having to ': 'they had ( it took )' 'waiting too long'. It does not require agreement in gender and number.Misuse if it is impersonal: 'there were few attendees'; «had abundant chairs»; «There will be enough vehicles»; «There will be additional bullfights». The verb will be combine in the singular, even Assistant 'go' conjugate the verb in infinitive, then 40 subjects; attendees, seats, vehicles, weird ) they are direct objects, which are checked because they are interchangeable for accusative pronouns with singular verb: «any;» There them; There them; «There will be». Correct conjugation: 'there were few attendees'; "there was abundant chairs"; «There will be enough vehicles»; "there will be ( or there will be )" Bull adicionales».««Be». Generally denotes convenience, necessity, obligation, or future action. Is equivalent to having to: «I have of wanting to»; 'We had new appointment'; «The game had to be postponed;» «Does not have to be me who do so!»; «»«Not a reward would change its purpose». The use of «habemos» is inadmissible for the first person plural of the present indicative: «Habemos many protesters '; You should read 'are many the protesters'. (Excerpt from extensive explanation in the «dictionary Pan-Hispanic of doubt», «haber» 41 entry;