[d.] Do not use don't in the third person singular. Use doesn't. Don't is contraction of do not.

Exercise:

  1. She said not to buy those sort of carpet tacks. These kind of apples won't keep. I don't care for these boasting kind of travelers.
  2. Neither of us were in condition to run the race. Every one assured Mrs. Merton they had spent a pleasant evening.
  3. He don't suffer much now. I don't care if she don't come today.
  4. Each of us in that dismal waiting room were angry with the agent for telling us the train was not late.
  5. No one of the girls will tell their age. It don't matter.
[Agreement]

[52a.] A verb agrees in number with the subject, not with a noun which intervenes between it and the subject.

[b.] The number of the verb is not affected by the addition to the subject of words introduced by with, together with, no less than, as well as, and the like.