CONDITIONAL-IF
Conditional Sentences are also known as Conditional Clauses
or If Clauses. They are used to express that the action in the main clause
(without if) can
only take place if a certain condition (in the clause with if) is fulfilled. There are three types of
Conditional Sentences. There is four type on conditional clauses, such
as:
1. Conditional
Sentences Type 0
Conditional type zero is used to talk about general
truths, scientific facts or things which always happen under certain
conditions. The tense in both parts of the sentence is the simple present. In
zero conditional sentences, the word "if" can usually be replaced by
the word "when" without changing the meaning. The zero conditional is
used to talk about things which are always true, scientific facts, general
truths.
Form : If + Simple Present, + Simple Present
Example:
·
If you cross an international date line,
the time changes.
·
Phosphorus burns if you expose it to
air.
·
If I wake up early, I go jogging.
2. Conditional
Sentences Type 1
Conditional Sentences Type I refer to the future. An action
in the future will only happen if a certain condition is fulfilled by that
time. We don't know for sure whether the condition actually will be fulfilled
or not, but the conditions seems rather realistic – so we think it is
likely to happen.
Form :if + Simple
Present, will-Future
Example :
·
If I find her address, I will send her an invitation
The main clause can
also be at the beginning of the sentence. In this case, don't use a comma.
·
I will send her an invitation if I find her address
Note : Main clause and or if clause might be negative. See Simple Present and will-Future on how to form negative sentences.
·
If I don’t see him this afternoon, I will phone him in
the evening.
3.
Conditional Sentences Type 2
Conditional Sentences
Type II refer to situations in the present. An action could happen if the
present situation were different. I don't really expect the situation to
change, however. I just imagine „what would happen if …“
Form : if + Simple Past, main clause with
Conditional I (= would + Infinitive)
Example:
·
If I found her address, I would send her an invitation.
The
main clause can also be at the beginning of the sentence. In this case, don't
use a comma.
·
I
would send her an invitation if I found her address.
Note: Main clause and / or if clause might
be negative. See Simple Past und Conditional I on how to form negative sentences.
·
If I
had a lot of money, I wouldn’t stay here.
Were instead of Was, In IF Clauses Type
II, we usually use ‚were‘ – even if the pronoun is I, he, she or it –.
If I were you, I would not do this.
4. Conditional
Sentences Type 3
Conditional Sentences Type III refer to situations in the
past. An action could have happened in the past if a certain condition had been
fulfilled. Things were different then, however. We just imagine, what would
have happened if the situation had been fulfilled.
Form : if +
Past Perfect, main clause with Conditional II
Example :
·
If
I had found her address, I would have sent her an invitation.
The main clause can also be at the
beginning of the sentence. In this case, don't use a comma.
·
I
would have sent her an invitation if I had found her address.
Note: Main clause and / or if clause might
be negative. See Past Perfect and Conditional
II on how to form
negative sentences.
·
If I
hadn’t studied, I wouldn’t have passed my exams.
Source: https://www.ego4u.com/en/cram-up/grammar/conditional-sentences