EXERCISE 22. a) Read and state the function of the verbs be, have. It is illegal to drive in the US and UK if you have drunk more than the legal limit of alcohol. If the police stop you when you are driving and believe that you may have drunk too much alcohol they will usually test your breath using a special device. In the US and UK, drink-driving is considered a very serious crime, for which you can be put in prison and lose your legal right to drive.

In the provided text:

• 'is' (It is illegal): Function - links the subject 'It' to the predicate adjective 'illegal', expressing a state of being.
• 'have' (you have drunk): Function - used as an auxiliary verb to form the present perfect tense, indicating an action completed before the present time.
• 'are' (you are driving): Function - used as an auxiliary verb to form the present continuous tense, indicating an action happening now.
• 'have' (you may have drunk): Function - used as an auxiliary verb in the perfect infinitive, expressing a possibility in the past.
• 'is' (drink-driving is considered): Function - links the subject 'drink-driving' to the predicate 'considered', showing a state of being in passive voice.
• 'can be' (you can be put): Function - forms the passive voice with 'can', indicating possibility.