Plural form of 'that'?

[Ulysses]

Does a plural form of 'that' exist?

E.g. The chairs that have cushions are comfortable.

 

[Tdol]

It does, but not in your example. If you had 'Those chairs are comfortable', it would be plural.

 

[infiniteone]

As far as I know, You can use "that" as a relative pronoun, regardless of plurality.

 

[Rainsanctum]

Singular: That chair that has a cushion is comfortable.
Plural: Those chairs that have cushions are confortable.

However the word "that" in the sentence you gave is an introductory word to introduce the relative clause "have cushions" if it's the "that" you referred to. In this case, it indeed doesn't have any other form when serving as an introductory word for clauses.

 

[BobK]

Singular: That chair that has a cushion is comfortable.
Plural: Those chairs that have cushions are confortable.

However the word "that" in the sentence you gave is an introductory word to introduce the relative clause "have cushions" if it's the "that" you referred to. In this case, it indeed doesn't have any other form when serving as an introductory word for clauses.

Please :-| As I told you yesterday (https://www.usingenglish.com/forum/ask-teacher/119882-may-well.html#post593863 ), your contributions to this forum should make it clear that you are not a teacher.

The issue is simple. When 'that' is a subordinating conjunction, the notion of singular/plural cannot arise; those words have no possible meaningful application.

When 'that' is a demonstrative (either adjective or pronoun) the plural - as Tdol said - is 'those'.

b