You shouldn't watch tv so much. should + infinitive (should do / should watch etc. ): do i/we/you/they should stop he/she/it shouldn't go watch etc. b you should do something = it is a good thing to do, it is the right thing to do: tom doesn't study enough. he should study harder. o it's a good film. you should go and see it. when you play tennis, you should always watch the ball. c you shouldn't do something = it is not a good thing to do. shouldn't = should not: tom shouldn't go to bed so late. d you watch tv all the time. you shouldn't watch tv so much. we often say i think should i think should : 0 i think lisa should buy some new clothes. do you think i should buy this hat? (= i think it is a good idea. ) o it's late. i think i should go home now. a: shall i buy this coat? b: yes, i think you should. i don't think should i don't think you should work so hard. (= i don't think it is a good idea. ) i don't think we should go yet. it's too early. do you think should do you think i should buy this hat? c what time do you think we should go home? must is stronger than should: o it's a good film. you should go and see it. o it's a fantastic film. you must go and see it. another way to say should is ought to: it's a good film. you ought to go and see it. (= you should go) i think lisa ought to buy some new clothes. (= lisa should buy) shall units 27-28 must unit 31