2. How is Coca-Cola made?
Coca-Cola, also known as Coke, is a soft-drink which has been
produced since 1886 in more than 200 countries.
The ingredients and its formula are a secret. It is said that only two
managers know it and it mustn’t be revealed. The only thing we know
about its composition is that water and sugar are used to make it.
Every drink is made with the water of the place where the factory is
located. Nevertheless, the secret composition, that is going to be added,
is the same in every country.

3. How is Coca-Cola made?
This water has to be treated. It is left in huge vats and mixed with
sugar, after having been heated. Later on, the secret composition is
added to this sweet water and the syrup is ready to be bottled.
Machines are in charge of introducing the drink into bottles and cans.
Different tags were designed to distinguish normal and light cokes.

4. Examples of Passive Tenses
The structure of the passive voice consists of having the verb to be in
the same verb tense of the active voice followed by the past participle of
the main verb in the active sentence:
Present Simple: use/-s --- is/are used
Past Simple: designed --- was/were designed
Present Perfect: have/has produced --- have/has been produced
Past Perfect Simple: had drunk --- had been drunk
Future with will: will deliver --- will be delivered
Future with going to: is/are going to add --- is/are going to be added
Modal Verb: must reveal --- must be revealed

5. 5 Sentences in Active Voice
1. Only two managers know it.
It is known by two managers.
4. They have to treat this water.
This water has to be treated.
2. They use water and sugar.
Water and sugar are used.
5. They add the secret composition.
The secret composition is added.
3. They designed different tags.
Different tags were designed.

6. 5 Sentences in Active Voice
1. Only two managers know it.
It is known by two managers.
4. They have to treat this water.
This water has to be treated.
2. They use water and sugar.
Water and sugar are used.
5. They add the secret composition.
The secret composition is added.
3. They designed different tags.
Different tags were designed.