Ii. перепишите следующие предложения; подчеркните в каждом из них модальный глагол или его эквивалент. переведите предложения на язык. 1. every engineer must know the properties of the material he works with. 2. the results of the experiment should be checked very carefully. 3. he is able to walk long distances. 4. every researcher ought to be interested in the results of his work. 5. you needn’t disturb him, i can tell you everything. 6. you may begin reading.