Exercise 1Translate the sentences; explain the usage of the modal verbs:1.

Exercise 1
Translate the sentences; explain the usage of the modal verbs:
1. The green wire should be connected to terminal 4.
2. You mustnt turn the machine when the red warning light is on.
3. This lever can be up or down.
4. We can recycle old products to make new ones.
5. The red switch has to be on.
6. A rheostat is a resistor whose resistance value may be varied.
7. That morning he had to leave his car at home.
8. You cant ride a motorbike with no helmet.
Exercise 2
Put the verbs into Past Simple. Use the modal verbs and their equivalents:
1. He must work hard to finish his experiment.
2. I can devote myself to scientific work.
3. You may repeat this experiment.
4. He must illustrate this law by several experiments.
5. She can study automation in the college.
6. They may carry out these experiments at the laboratory