If I have extra money, I usually buy a laptop equipment with it.
I will buy a new laptop next month if I have some extra money.
If I had some extra money, I would buy a new laptop today or tomorrow.
I would have bought a new laptop last month if I had had some extra money.
Conditional sentences are also known as conditional clauses or if clause. 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.
SITUATION
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IF CLAUSE
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RESULT CLAUSE
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EXAMPLE
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1.True / in the present / future
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Simple present
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Will + simple form
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If I have enough time. I watch TV every evening.
If I have enough time I will watch TV later on tonight.
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It is possible and also very likely that the condition will be fulfilled.
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2. Untrue / in the present / future
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Simple past
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Would + simple form
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If I found her address, I would send her an invitation
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It is possible but very unlikely, that the condition will be fulfilled.
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3. Untrue / in the past
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Past perfect
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Would have + past participle.
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If I had found her address, I would have sent her an invitation
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It is impossible that the condition will be fulfilled because it refers to the past.
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