1) I must save to travel to the US this summer. a) We use HAVE TO more often in questions. b) For other tenses, we use HAVE TO. c) We use MUST in the present tense without an infinitive. d) We use HAVE TO when the obligation comes from someone else. 2) I’m going to have to save money to travel to the US this summer. a) We use HAVE TO more often in questions. b) We use HAVE TO when the obligation comes from someone else. c) We use MUST for an obligation we give ourselves. d) For other tenses, we use HAVE TO. 3) Do we have to study this? a) We use HAVE TO when the obligation comes from someone else. b) We use HAVE TO more often in questions. c) For other tenses, we use HAVE TO. d) We use MUST in the present tense without an infinitive. 4) My teacher says I have to study. a) For other tenses, we use HAVE TO. b) We use HAVE TO more often in questions. c) We use MUST in the present tense without an infinitive. d) We use HAVE TO when the obligation comes from someone else. 5) You really must see a doctor. a) We use MUST for strong advice. b) We use HAVE TO when the obligation comes from someone else. c) For other tenses, we use HAVE TO. d) We use MUST in the present tense without an infinitive. 6) I must study if I want to pass. a) We use HAVE TO more often in questions. b) For other tenses, we use HAVE TO. c) We use MUST for strong advice. d) We use MUST for an obligation we give ourselves.

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