Matching Pairs have to, must & should, plusOnline version Checking vocabulary learnt/verb use MBO outdoor year1. Match the sentences or the missing word by the dots ....... by Tina Oomes-Swift 1 You need to do this. It is compulsory. 2 Do not do this. It is prohibited (not allowed). 3 It is a bad idea to do this. 4 Pessimistic means... 5 It isn't necessary, but it is a good idea. 6 Optimistic means... 7 It is not allowed. You ..............................park your car here. 8 Frustrated means... 9 A branch might fall out of that tree, You .......................... park your car here. You must not do it. mustn't You shouldn't do this. (You should not do this.) You must do it. shouldn't ...negative state of mind and thinking that things will go badly. You should do it. ...feeling annoyed that you can't do something or that something is not as you think it should be. ...positive state of mind and thinking that things will go well.