Презентация на тему по английскому языку на тему : Conditional sentense

conditional tense says that an action is reliant on

something else.
The two most common conditionals are real and unreal.

Conditional Type I) describes situations based on fact.

The

unreal conditional (often named 2nd Conditional or Conditional Type II) describes unreal or imaginary situations.

There is also what we call the 3rd conditional (often named Conditional Type III), used to express no possibility of something having happened in the past, and the 0 conditional (often called the zero conditional),used to express absolute certainty.

is used to express situations based on fact in

the present or future (things which may happen).

(IF Clause) (Main Clause)
Present Simple Future

If I see you tomorrow, I will buy you a drink.

or…
(Main Clause) (IF Clause)
I will buy you a drink if I see you tomorrow.

not'
(IF Clause)

(Main Clause)
Unless you hand in your homework, I won't mark it.
means
If you don't hand in your homework, I won't mark it.

or

(Main Clause) (IF Clause Clause)
I won't mark your homework unless you hand it in.
means
I won't mark your homework if you don't hand it in.

phone my friend.
=
I will phone my friend if

I have time today.

(It is possible that I will have time - therefore the condition is real).

If I go to England, I will buy some Cheddar cheese.
=
I will buy some Cheddar cheese, if I go to England.

(It is possible that I will go to England - therefore the condition is real).

Note! We never use will, or won't in the if clause

conditional is used to express unreal situations in the

present or future. Often used to express a wish.

(IF Clause) (Main Clause)
Past Simple Conditional

If I won the lottery, I would buy a new house.
or...
(Main Clause) (IF Clause)
I would buy a new house if I won the lottery.

that.
=
I wouldn't do that, if I were

you.
(I am not you - therefore the condition is unreal)


If I had more time, I would do more on my websites.
=
I would do more on my websites, if I had more time.
(I don't have more time - therefore the condition is unreal).

Note! We never use would, or wouldn't in the if clause

conditions in the past that did not happen. Often

used to express criticism or regret with would have, could have or should have.

(IF Clause) (Main Clause)
Past Perfect Conditional Perfect

If I had worked harder,I would have passed my exam.
If I had worked harder,I could have passed my exam.
If I had worked harder,I should have passed my exam.

(IF Clause)

I would have passed

my exam if I had worked harder.
I could have passed my exam if I had worked harder.
I should have passed my exam if I had worked harder.

Note! We never use would have, or wouldn't have etc in the if clause.

have failed.
=
You would have failed, if I

hadn't helped you.
(I helped you so you didn't fail)


If it had been sunny, we could have gone out.
=
We could have gone out, if it had been.
(We didn't go out because it wasn't sunny)

used to express general truths and facts (often things

based on scientific fact).
We use the simple present tense.

(IF Clause) (Main Clause)
If you heat water to 100°C,it boils.

or...

(Main Clause) (IF Clause)
Water boils if you heat it to 100°C.

Note! Most zero conditional sentences mean the same thing if "when" is used instead of "if".