The difference between A, AN, SOME and ANY. - English Grammar Rules.
Why do we add S to some words but ES to others? And when a word ends with Y, how do we know whether to change the Y to I before adding the plural suffix? And why on earth does knife become knives? You can unravel these mysteries with six simple rules.
Writing is hard, and writing without repeating yourself is very, very hard—but as you may have already noticed, one of the most repeated words in English is the intensifying modifier "very.
Prepositions of time examples - learning English grammar