could
UK[kʊd]US[kʊd]
modal
Used as the past tense of 'can' to indicate ability or possibility in the past.
modal
Used to make polite requests or offers.
modal
Used to express conditional possibility or suggestion.
Etymology
The word 'could' is a simplex form, a grammaticalized modal verb whose structure cannot be meaningfully segmented into modern English morphemes. It evolved from the Old English 'cuðe', the past tense of 'cunnan' (meaning "to know, to be able"). This Old English verb itself traces back to the Proto-Germanic 'kunnaną', related to concepts of knowing and mental ability. Over centuries, 'could' underwent phonetic reduction and specialization, losing its original connection to 'knowing' and becoming the primary modal verb for expressing past ability, conditional mood, and polite modality in Modern English.
Analysis
N/A
Examples
I could run very fast when I was younger.
Could you please pass the salt?
We could go to the cinema if you're free tonight.