Hiya,
'want' would be a main verb as it is virtually impossible for an auxiliary to stand alone. Auxiliaries must always occur with a main verb, but main verbs can stand alone. In English, there...
The auxiliary verb also is called a helping verb. For it's used to help form the tenses that are composed of two verbs.
An example is the past tense that's called 'passe compose', or 'composed...
The word "were" is a form of the verb "to be". It can be both a main verb (The children were cold.), or an auxiliary verb (The children were complaining about the cold.).