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Past Tense
Simple Past
Present Perfect
Modal Verbs. https://www.youtube.com/watch?v=Ckl_XQDDQqs Modal verbs are auxiliary verbs that can not function as a main verb, unlike the auxiliary verbs "be", "do" and "have" that can function as a main verb. Modal verbs express modality, ability, possibility, need or other condition. We use them for the future and the conditional. As complementary verbs that are, modal verbs do not work without another verb. This other verb always goes after the modal verb and is in the base form (the infinitive without "to"). Modal verbs are not conjugated and do not have time. Modal verbs are:       can   could   may   might   will   shall   should   ought to   must/have to   would https://www.englishgrammar.org/modal-auxiliary-verbs-exercise-6/
EXERCISE OF PRESENT SIMPLE https://www.curso-ingles.com/practicar/ejercicios/present-simple EXERCISE OF PAST SIMPLE   https://www.curso-ingles.com/practicar/ejercicios/past-simple
https://www.youtube.com/watch?v=aV5FfVDXxj8