Modal verbs (can, could, should, must)

Modal verbs (can, could, should, must)
Modal verbs (can, could, should, must)
Modal verbs (can, could, should, must)
Modal verbs (can, could, should, must)

คำแนะนำของผู้เขียน

Modal verbs: can, could, should, must. Language functions: ability, possibility, inability, impossibility, obligation, prohibition, advice.