δάσκαλος

Modal auxiliaries are helping verbs used before the main verb to express ideas such as ability, permission, possibility, obligation, prohibition, advice, certainty, and lack of necessity.Common modal auxiliaries: must | must not | can | could | may | might | need not | should | ought to | had betterA modal auxiliary is always followed by the base form of the verb.Correct: I can swim. Incorrect: I can swims.Correct: You must stop. Incorrect: You must to stop.Correct: He should revise. I...