Modal verbs and semi-modalsOnline version Grammar presentation by Mª Luz Rotea 1 MODAL VERBS MODALS VERBS AND SEMI-MODALSModal verbs can't be used in all tenses, just some of them depending on the verb.Modal verbs don't use -s for 3rd person singular .Modal verbs are followed by infinitive (when we refer to present actions) or by "have+past participle" (when we refer to past actions)Modal verbs don't need auxiliary verbs for negative and interrogative sentencesSemi-modals: In the following chart they are in yellow 2 MODAL VERBS 1 3 MODAL VERBS 2 4 MODAL VERBS 3