In the book's first unit, there's a revision of the use of the simple present and the present continuous. Here's a short refreshment and a few exercises for you to practice.
If you don't remember the difference between one and the other, go to this link. NB: Remember, present continuous and present progressive are the same grammar point. Now that you could revise the use of each grammar structure, try the exercises below:
You will also explore the use of the 0 conditional. Take a look at the explanation below, to analyse how it is formed and when it is used.
Zero
Conditional
for certainty
If you
heat ice, it melts.
We use the so-called zero conditional when the
result of the condition is always true, like a scientific fact.
Take some ice. Put it in a saucepan. Heat the saucepan. What
happens? The ice melts (it becomes water). You would be surprised if it did
not.
if
condition
result
Present Simple
Present Simple
If
you heat ice,
it melts.
Notice that we are thinking about a result that is always true for
this condition. The result of the condition is an absolute certainty.
We are not thinking about the future or the past, or even the present. We are
thinking about a simple fact. We use the Present Simple tense
to talk about the condition. We also use the Present Simple tense to
talk about the result. The important thing about the zero conditional is that the
condition always has the same result.
Look at these example sentences:
if
condition
result
Present Simple
Present Simple
If
I miss the 8 o'clock bus,
I am late for work.
If
I am late for work,
my boss gets angry.
If
people don't eat,
they get hungry.
If
you heat ice,
does it melt?
result
if
condition
Present Simple
Present Simple
I am late for work
if
I miss the 8 o'clock bus.
My boss gets angry
if
I am late for work.
People get hungry
if
they don't eat.
Does ice melt
if
you heat it?
We often
use when instead of if, for example: When I
get up late, I miss my bus.