PRESENT SIMPLE PASSIVE

a. Active grammar

Most sentences in English are active. 
Form: subject + verb + object.
 Americans spend more than $ 110 billion on fast food every year.

Use the passive when who causes the action is unknown or not important.

65 million fast- food meals are eaten every day in the USA.

Form : am /is /are + past particple

These burgers are made from 100% beef.

b. Underline the present simple passive  in the next text.

Communication

Fast facts:
Over fifty million text messges are sent each day in the UK.
An average office worker deals with forty-six phone calls, twenty- five emails,sixteen voice mails, twenty-three items of post and nine mobile phone calls every day.

Practice in this  link, elementary level: Active and passive voice:
www.englishexercises.org

d