蔡ifgrammar.ppt

9A Oxford English Module 2 Unit 5
Grammar: Adverbial clauses (II)

Miss Cai
Grade Nine
If I stick a pin into a balloon, it bursts.
The if clause talks about the possible action.
The second clause talks about the result of the action..
The result will certainly happen.
If sentences: actions with definite results
A balloon bursts if I stick a pin into it.
___
____
,
If you boil water, it _____________.
becomes steam
A1
Water becomes steam if you boil it.
If you cool water, it ___________.
What happens to water if…?
turns into ice
Water turns into ice if you cool it.
Read these if sentences and match the possible actions with the results.
A2
Work in pairs. Read the dialogue below and make similar dialogues about the other sentences in A1.
A3
S1: What happens if you take a fish out of water?
S2 : It dies.
S1 : Are you sure?
S2 : Of course I’m sure. If you take a fish out of water, it dies.
Complete these sentences with the words in brackets.
A4
A balloon ________________________________________ it. (a pin/if/stick/you/bursts/into)
Metal ___________________________________________ it. (you/heat/melts/if)
Wood ________________________________________ water. (you/into/put/if/floats/it)
A glass __________________________________________ it. (drop/you/breaks/if)
quiz
What happens to ice if you heat it?
What happens to steam if you cool it?
What happens to people if there is no air?
What happens to paper if you put it into fire?
A5
Ice turns into water if you heat it.
If you heat ice, it turns into water.
Steam becomes water if you cool it.
If you cool steam, it becomes water.
People die if there is no air.
If there is no air, people die.
Paper burns if you put it into fire.
If you put paper into fire, it burns.
If it rains,____________________