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This changes to these if the noun that follows is in the plural.
Also avoid the use of this instead of the personal pronoun: John had the book but he gave this to his brother should be John had the book but he gave it to his brother.
The plural form works means a factory or the writings of an author: The works of Shakespeare are many. I visited the steel works.
When only one thing is meant we say a clap of thunder and a flash or bolt of lightning.
The names of sciences and subjects ending in -ics (like mathematics, physics, politics, gymnastics) generally take a singular verb.