Нужно, много . перепишите предложения, употребляя must+simple/perfect infinitive для выражения предположения. example: of course, he is somewhere here. – he must be somewhere here. certainly, she knew that something was wrong. – she must have known that something was wrong. i am sure the information was wrong. she was obviously upset by something. probably, he recognized you by the photo in the papers. he is sure to be in at this time. of course, she is trying to help you. she is certain to be waiting for you at home. probably, the play is over by now. no doubt, she knew what she was about to do. probably, the dog was hungry