We often use a possessive adjective with a noun. The noun can be singular or plural. We do not use an article with a possessive adjective.
10. Open questions with be pp12–13 Question word Verb How long What
is is (‘s) Verb Complement the bolt? the pressure?
11. Sentences with be + preposition + noun p15 Subject
The thermometer The bolt
The screws Noun
is is
are
12. The noun phrase 4: a/an or the p15 Article
an the engine
We usually use a/an with a new noun. We use the for the second, third time, etc. Example: Petrol is an energy source. The energy source is used in many cars.
We also use the when there is only one. Example: The Sun is an energy source.
13. Sentences with be + the + noun p15 We can sometimes give the same information in two different ways.