1. Where are your manners?

2. Where is your manners?
(Which one is correct?)

3. He has good manners.
3-1. He has a good manner.
4. he has bad manners.
4-1 He has a bad manner.
5. You should learn table manners.
6. He has no manners.
6-1. He has no manner.
(Which ones are ungrammatical?)

1, 3, 4 (with a capital H at the beginning), 5, and 6 are correct.

1. Both sentences are slightly incorrect. The correct phrase should be "Where are your manners?" This is because "manners" is plural, referring to a set of behaviors or customs, so it should be used with the plural form of the verb "are".

2. The correct sentence is "Where are your manners?"

3. The correct sentence is "He has good manners." Here, "manners" is used correctly as the plural form to describe someone's behavior or habits.

3-1. The sentence "He has a good manner" is grammatically correct but has a different meaning. It suggests that the person has one specific good way of behaving, rather than a consistent set of good behaviors.

4. The correct sentence is "He has bad manners." Similar to the previous example, "manners" is used correctly as the plural form to describe someone's behavior or habits.

4-1. The sentence "He has a bad manner" is grammatically correct but again has a different meaning. It implies that the person has one specific bad behavior, rather than a consistent set of bad behaviors.

5. The sentence "You should learn table manners" is grammatically correct. "Table manners" refers to the accepted behavior and etiquette during meals.

6. The correct sentence is "He has no manners." Here, "manners" is used correctly in the plural form to indicate that the person lacks proper behavior or etiquette.

6-1. The sentence "He has no manner" is ungrammatical. It does not correctly express the idea of lacking proper behavior because "manner" is singular and does not convey the same meaning as "manners" in this context.