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[Essay/영작] (CM-113) "Progress", "Thunder and Lightning", "Machinery"
최고관리자  |  20-02-23 10:15
461. Progress
(X) Tom has made great progresses.
(O) Tom has made great progress.

462. Thunder and Lightning
(X) There were thunders and lightnings.
(O) There was thunder and lightning.
Note: When only one thing is meant we say "a clap of thunder" and "a flash(or bolt) of lightning".

463. Machinery
(X) They're now using new machineries.
(O) They're now using new machinery.
Note: Machinery is a singular noun and always takes a singular verb and pronoun. 
We can say "a piece of machinery" or "pieces of machinery".