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First Conditional
The basic word in all conditional sentences is “if”. A conditional sentence has always two parts, one part to explain a possible situation, and the second part that explains the consequence.
Example: If it rains, they'll get wet.
We can also switch the two parts of a conditional sentence, therefore the “if”part is in the second clause.
Example: What will Jack do if he misses his plane?
There are four types of conditional sentences. 0 – The zero conditional 1 – The first conditional 2 – The second conditional 3 – The third conditional.
The first conditional sentences :
We use the first conditional when we want to talk about realistic and pragmatic situation in the present or in the future. The first conditional sentence form is shown in the table below .
First part(If-clause) | Second part(main clause) |
If + present simple tense | Will, Can, Must + verb (Infinitive form) |
50% possibility | 100% certainty |
Examples: If Jack studies hard, he will pass the physics exam. If Jack studies hard, he will not fail the physics exam. If Jack studies hard, he won't fail the physics exam. If Jack does not study hard, he will fail the physics exam. If Jack doesn't study hard, he'll fail the physics exam.

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