English grammar rule These singular noun
This, that, these, and those are referred to as “demonstratives,” and they go in pairs. This and that are singular, while these and those are plural. If your noun is plural, use a plural demonstrative. For singular nouns, use a singular demonstrative. Collective and uncountable nouns are considered singular.
Examples of 'These singular noun' rule
Incorrect These book will be written in English. Correct This book will be written in English. Correct These books will be written in English. Incorrect These supply came from the store. Correct This supply came from the store.