Сделать the sentences with (in order) to or because. nb: use to / in order (not) to + infinitive to talk about the purpose of an action. use because + subject + predicate (clause) - to talk about the cause. model: you need to work hard (in order) to pass your exam. you don’t need to worry because you know the subject very well. 1.you should leave earlier next time not … late for your lessons. 2. sonars are intended mainly … submarines or other subsurface objects. 3. radars are not usually installed on submarines … they cannot “see” at depth. 4. i want to buy this small car … to my country house. 5. i think you should buy this car … it’s cheap and easy to repair. 6. what are you doing? – we are installing a new fixed fire extinguisher installation … possible fires in machinery spaces and hangar decks. 7. why are you late? - … we’ve been stuck in a traffic jam. nb! use the following infinitives: to fight, to go, to detect, to be.