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1. i must brush my teeth. - anyone, most likely some disobedient child.

2. i have to brush my teeth. - a patient of dentist's, a human with diseased tooth.

3. i must tidy my room. - anyone, most likely some disobedient child.

4.i have to tidy my room. - anyone, probably a child.

5. i must take the medicine. - someone with easy form of illness.

6. i have to take the medicine. - most likely, a regular patient

if i had a chance to go to london i'd like to see not only the places of interest but many other interesting things there. certainly everyone knows that the most famous sights of the capital of the great britain are tower bridge over the river themes, big ben, the houses of parliament, trafalgar square, saint paul's cathedral, the british museum, art gallery. it seems i know all these sights well because we have been getting acquainted with them since the 5-th form up to now. i think it will be enough one-day excursion to see all these sights with my own eyes. i'd better visit the one of the numerous english pubs- the local beer halls where englishmen like to spend their free time reading, talking, discussing traditional matters - political, sports and weather over the glass of beer. or i'll try to feel myself as a real englishman visiting a house of a common english family. i'd like to sit round the fire place which is traditional for every english house. if i were lucky i would visit one of the competition or a tournament where traditional english sport games are played - rugby or lawn tennis, horse racing or cricket. i'd like to walk among the students of cambridge or oxford university in their campus and to imagine that i am one of them. i believe my impression on london won't be full if i don't visit madam tussad's museum in baker street. i'm looking forward to seeing their life - size wax portraits of kings and queens, well - known writers, singers and even criminals one of my evenings in london i'd like to spend in a disco club to watch the way english teenagers and young people spare their time, to listen to their popular groups, to make friends and what not.

whether the brother now reads the book, whether he plays the computer, whether the grandmother sleeps, whether mum prepares a lunch, whether the grandfather the tv looks, whether the father reads, whether kate plays the piano, whether the brother listens to music, whether reks near to it sits.

it's not always easy for the old and the young to find a common language.

это правильное утверждение, так как все люди разных возрастов жили в разное время. у более пожилых людей существуют свои стереотипы, также и у молодёжи. но всё-таки нужно стараться искать общий язык с пожилыми людьми, потому что они наши предки и знают намного больше нас. 

this is a correct statement, because all people of all ages living in different times. the older people have their own stereotypes, and young people too. but we must try to find a common language with the elderly people, because they are our ancestors and know far more than we do.