Grammar

Focuses is correct in almost all English writing today, including American and modern British English. Focusses is not wrong, but it is a rare, older variant found mostly in older…

"On this matter" and "in this matter" are both correct, but they're not interchangeable. "On this matter" refers to a topic or issue you're discussing or giving an opinion about.…

Use is with a singular subject and are with a plural subject. That's the core rule behind is vs are, and it covers most sentences you'll ever write. The confusion…

"Herd" is correct when you mean a group of animals, and "heard" is correct when you mean the past tense of "hear." They sound identical, which is exactly why they…

"Stint" and "stent" are two completely different words that happen to look and sound alike. A stint is a fixed period of time spent doing something, like a job or…

Both "mama" and "momma" are correct. Neither one is a misspelling of the other. They're recognized variant spellings of the same informal word for "mother," and dictionaries list both. The…

"Reevaluation" and "re-evaluation" are both correct. Neither one is a misspelling. The real difference is regional style: American English usually drops the hyphen, while British English tends to keep it.…

Performed is the correct word almost every time you're describing an action — completing a task, giving a performance, or carrying out a duty. Preformed is also a real word,…