Compléter Must, have to, shouldVersion en ligne Review of modal verbs par Giovanna Imperatori 1 You always carry an umbrella . British weather is very ! You pay to visit most museums and art galleries . Entrance is usually . If you are sightseeing in London , you buy a Travelcard which gives you cheaper travels on trains , buses , and the London Underground . You leave a tip in a restaurant but if service has been good , 10% extra is a normal amount to leave . You smoke in any public building . It is prohibited by . When talking to British people , you ask personal questions ( like How much do you ? ) as some people think this is . You go for a trip on the London Eye . The view of London from the top is .