Learn more about Grammar:Adjectives: An Easy Guide with ExamplesAdverbial Clause: Definition, Meaning and ExamplesAdverbs: Definition, Meaning, Usage and ExamplesAnalogy: Definition & Meaning (with Examples)ArticlesBad Adverbs: What Makes an Adverb "Bad" and Why (with examples)Clauses: Definition, Meaning, and How to Use ThemConjunctions: Definition, Grammar Rules and ExamplesCoordinating Conjunctions: Definition, Meaning and ExamplesDangling ModifiersDeclarative Sentence: Definition, Meaning and ExamplesExaggerationHomophones: Definition and ExamplesInfinitivesInterjections: Definition, Meaning, and ExamplesIntransitive Verb: Definition, Meaning, and ExamplesNouns: Definition, Meaning and Types Explained (with examples)Participles PluralsPrepositional Phrase: What Is It & How to UsePrepositionsPronoun: Definition, Meaning and Types Explained (with examples)Split Infinitive: The Complete Guide (with Examples)Subordinate Clause: Definition, Types, and ExamplesSubordinating Conjunctions: What Are They? (with Examples in Sentences)The Complete Guide to Transitive VerbsTransition Words and Phrases in EnglishTypes of VerbsVerbs: Types of Verbs, Definition and ExamplesWhat Is Symbolism in Writing?Word Classes
Why should you not overuse "could"?
Could is often overused or misused. The correct use of could indicates possibility. It means something might happen.
The election campaign could get ugly this year.
In many instances, people use could when they actually mean will, which is a more definitive word.
She could go to the store and buy one for herself.
This has a completely different meaning when you say:
She will go to the store and buy one for herself.
Only use could if you're describing truly conditional situations, or deliberately trying to be vague. If you're describing something which is definitely going to happen, use will.