Learn how to say Could correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word could:
(pt. of) can1 ⇒ he gave what he could give
used as a modal auxiliary in verbal phrases with present or future time reference, generally equivalent to can1 in meaning and use, with the following functions:
expressing esp. a shade of doubt or a smaller degree of ability or possibility ⇒ it could be so
expressing permission ⇒ could I go?
forming the present conditional ⇒ it would help if he could wait
forming the past conditional ⇒ he would have left if he could
expressing or suggesting politely less certainty than can1 ⇒ could you wait?
(pt. of) can1 ⇒ he gave what he could
(pt. of, obsolete) can1