Spoken english through telugu | spoken english in telugu | usage of can and could in telugu

Can & Could మధ్య ఉన్న తేడా ఏంటో ఈ వీడియోలో చెప్పాను, what is the correct usage of "Can and Could" Most people don't know the exact difference between can and could. To be precise the exact meaning of CAN is present ability where as COULD is past ability.