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HAVE TO/ MUST • Must expresses the speaker's feelings, whereas have to expresses, above all, an impersonal idea: You must come. You are obliged to come (I require that you come) You have to come. You are obliged to come. (There's a rule requiring you to come) Must I wear this tie? Am I obliged to wear this tie? (What do you think?) Do I have to wear this tie? Am I obliged to wear this tie? (Is there a rule about ties?) • Have to mainly expresses general obligations, while must is used for specific obligations: I have to brush my teeth twice a day. I must tell you something. Important: To express obligation, duty or necessity in the future or the past, must and need are not used. They are replaced by have to: We must (need to) buy another ticket. We had to buy another ticket yesterday. We'll have to buy another ticket later. However, in their negative forms, mustn't and don't have to have completely different meanings: • Mustn't expresses ...
SHOULD/ SHOUND´N : We use should and shouldn't to give advice or to talk about what we think is right or wrong. You should means something like I think it is a good idea for you to do it. You shouldn't means something like I think it is a bad idea for you to do it. Should is used to express the opinion of a speaker and often follows I think or I don't think. Examples -You look tired. I think you should take a few days off. -Alice works very long hours. She should to talk to her boss. - I have an English test tomorrow. - I shouldn't worry if I were you. You have worked really hard. - I never have enough money. - I don't think you should go out so much. Negative Te orden is: Subjet + verb in simple form+ shouldn't + complement Afirmative The orden is: Subjet +verb in simple form+ should + complement
PAST CONTINUOS PROGRESSIVE The continuous past is used for actions that were happening at a specific time in the past. As the present continuous, it is formed with the auxiliary verb "to be" and the verb + ing. :) + WAS/WERE +V-ING :) + WASN´T/ WEREN´T + V-ING 1. WAS/WERE + :) + V-ING + ? 2. WH + WAS/WERE + :) + ? here are several exercises to practice : https://www.curso-ingles.com/aprender/cursos/nivel-intermedio/verb-tenses-past/past-continuous
PRESENT PERFECT The present perfect is more or less equal to the perfect preterite of Spanish. :) + have/has + v-past participle :) + haven´t/hasn´t + v- past participle have/has + :) + v- past participle HAVE : i, you, we, they HAS : he, she, it here are several exercises to practice : https://www.curso-ingles.com/aprender/cursos/nivel-avanzado/verb-tenses-present-perfect/present-perfect