Could | ENGLISH PAGE
https://www.englishpage.com/modals/could.htmlcould suggestion: 1. NO PRESENT FORM 2. You could have spent your vacation in Hawaii. 3. You could spend your vacation in Hawaii. NO NEGATIVE FORMS : could past ability: I could run ten miles in my twenties. I could speak Chinese when I was a kid. "Could" cannot be used in positive sentences in which you describe a momentary or one-time ability.
'can' and 'could' | - | LearnEnglish
https://learnenglish.britishcouncil.org/.../can-and-couldThe negative form is can't in spoken English and cannot in written English.. We sometimes say cannot, but it is very emphatic.. The negative form of could is couldn't in spoken English and could not in written English.. can and could: possibility 1. Matching_MTYzNjc= can and could: possibility 2. GapFillTyping_MTYzNjg= can and could: other uses 1. Matching_MTYzNjk= can and could: …