Singular they emerged in 14th century English, about a century after plural they. Initially criticized by grammarians as error in mid-18th century. Became more accepted with rise of gender-neutral language. By 2020, most style guides accepted singular they as personal pronoun
Both "What do you like to do?" and "What do you like doing?" can be used interchangeably. Context is essential for understanding the meaning of both forms
Old English had a single third-person pronoun from Proto-Germanic *hi-. Modern "he" developed from neuter singular, starting without h in 12th century. Middle English separated neuter and feminine genders, creating modern forms. By 15th century, Middle English forms solidified into current forms
Could indicates general skill, like "I could still read without spectacles". Could with specific verbs means ability, like "I could hear the phone". Could and was able to can be interchangeable in general past ability
"Man" is singular noun referring to adult male human. "Men" is plural form of "man" referring to multiple adult males
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