Which sentence is correct when comparing things. For example:

  1. "Display do not have black spot"

  2. "Display does not have spot"

another example:

  1. "Theorem do not have a proof"
  2. "Theorem does not have a proof".
  • 1
    Generally, with singular things, you use does. With things that are plural, you use do. – Michael Rybkin Apr 23 '18 at 7:27

"The display (singular) DOES not have..."

"The cows (plural) DO not have..."

This is similar to most verbs, including "Go":

 The cows go home together. 
 The cow goes home by himself.
  • When the subject is plural (or the pronouns I/we/they), the verb typically does not end in an "s" (or "es"). "Dogs go..."

    When the subject is singular, or (the pronouns he/she/it), the verb ending is usually "s" or "es": "He goes..."

Most verbs, including Go, Try, Do, Play, Want, Need, Take, Eat, Sleep -- are conjugated with an "s/es" ending for singular subjects.

"Do" is just a little unusual, because the pronunciation for the singular and plural subjects are different. That is unlike "Go" and all the other verbs listed above, for which adding "s/es" at the end does not change the sound of the vowel. "Go/Goes" have the same long "O" sound. "Do/Does ('Doo'/'duhz')" sound different.

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