title_body: Are there languages with five conjugations? If not, how would one construct one? Most languages I am familiar with have six different person/number combinations for verbs:
  
  Singular
  
  
  1st (I)
  2nd (you)
  3rd (he/she/it)
  
  
  *Plural
  
  
  1st (we)
  2nd (you (all))
  3rd (they)
  
  
  Obviously, verb conjugation is more complicated than just these combinations (other features include tenses, aspects, mood (eg imperative), and gerunds), but for now, just focus on person/number. Is there some way to collapse these six combinations into five? On a related note, are there any natural languages with five conjugations?
  
  Also, I need exactly five conjugations. Are there normal languages with only five conjugations? If there aren't, what would be the most realistic way to implement this?
upvoted_answer: If you have two features (number/person), it seems tricky to have five options (or any other odd number for that matter). However, there is an easy way: simply collapse singular and plural for one of the persons. 
  
  There is actually a real example in English (and several other languages): the pluralis majestatis ("Royal We"). Simply discard the first person singular and use the first person plural instead.
  
  We are not sure what other languages use this, but we have definitely heard it in English and German. It would not be surprising to us if it occurred in other languages as well.
  
  Sounds a bit odd, but would be an easy option.