Переведите предложения, подчеркните в каждом из их модальный глагол и его

Переведите предложения, подчеркните в каждом из их модальный глагол и его эквивалент: 1. Artificial light can be produced in several ways. 2. Objects may reflect most of one colour, half of another colour, and a small percentage of some others. 3. You must read this book. Its really excellent. 4. English school children have to learn a complicated system of weights and measures. 5. You are to stay at the laboratory till the professor comes. That is his request. 6. You have put too much in your rucksack you will never be able to carry all that.