Modal verbs: can and could in English – Ағылшын тілі

Modal verbs "can" and "could" express ability or possibility in English. "Can" is used in the present (e.g., "I can swim") and forms questions (e.g., "What can you do?"). The negative form is "can't" (e.g., "She can't speak French"). "Could" is the past form of "can" (e.g., "I could help him") with a negative form "couldn't" (e.g., "I couldn't ski").