What tense pattern does the zero conditional use and when is it used?
Both clauses use the present simple; it's used for general truths or facts (e.g., 'If you heat water to 100°C, it boils').
Video Summary
Learn English Grammar: The 4 Conditionals
Main takeaways
01
zero conditional: general truths — present simple in both clauses
02
first conditional: real future possibilities — if + present simple, will + base verb
03
second conditional: unlikely or hypothetical present/future — if + past simple, would + base verb
04
third conditional: past unreal/missed opportunities — if + past perfect, would have + past participle
05
the if-clause can appear before or after the main clause without changing meaning
Key moments
Questions answered
How do you form the first conditional and what does it express?
Use if + present simple in the condition and will + base verb in the result; it expresses real, possible future events (e.g., 'If I see her, I will tell her').
When should you use the second conditional and what's its structure?
Use it for unlikely or hypothetical present/future situations: if + past simple in the if-clause, and would + base verb in the main clause (e.g., 'If I won the lottery, I would buy a house').
What does the third conditional show and how is it formed?
It shows past unreal situations or missed opportunities: if + past perfect in the if-clause, and would have + past participle in the main clause (e.g., 'If I had gone to bed earlier, I would have caught the train').
Can you switch the order of the if-clause and main clause?
Yes — you can place the if-clause before or after the main clause without changing the meaning, but keep the required tenses.
The Zero Conditional 00:46
"The zero conditional is for statements which are generally true."
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The zero conditional, the simplest of the conditionals, is used for general truths or facts that are always true.
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An example is: "The TV comes on if you press the button," which demonstrates that pressing the button will always result in the TV turning on.
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The structure of zero conditional sentences includes two clauses: the "if" clause (subordinate clause) and the main clause, both utilizing the present simple tense.
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You can place the "if" clause either at the beginning or in the middle of the sentence, such as "If you heat water to 100° C, it boils."
The First Conditional 03:30
"The first conditional expresses things that are possible and real."
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The first conditional is used for real and possible situations in the future.
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An example is: "If I see her, I will tell her," indicating that seeing her might occur and telling her afterward is possible.
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This structure employs the present simple in the "if" clause and the future simple with "will" in the main clause.
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Another example is: "I will go shopping on the way home if I have time," illustrating intention based on a possible future circumstance.
The Second Conditional 05:53
"The second conditional deals with situations that are unlikely or impossible."
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The second conditional is applied to situations that are not likely to happen or are impossible.
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For instance, "If I won a lot of money, I would buy a big house" suggests an unlikely scenario of winning money.
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This structure combines past simple in the "if" clause with "would" plus the base verb in the main clause.
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An additional example is: "If I had his number, I would call him," which expresses an impractical situation implying that the speaker does not actually have the number.
The Third Conditional 09:05
"The third conditional is used for situations that are too late to change."
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The third conditional refers to past situations that cannot be altered anymore, expressing missed opportunities.
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An example is: "I would have lost weight if I hadn't eaten so much," indicating that the speaker did not lose weight due to overeating.
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This structure involves the past perfect in the "if" clause and the construction "would have" plus the past participle in the main clause.
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Another example is: "If I had gone to bed earlier, I would have woken up in time to catch the train," highlighting a past action that influenced the present situation.
The First Conditional: Present Simple and Future Tense 17:29
"If it is sunny tomorrow, we will go to the beach."
- The first conditional is used to describe a possible future event based on a present condition. An example is, "If it is sunny tomorrow, we will go to the beach," which leverages the present simple tense to indicate a future possibility.
The Third Conditional: Past Perfect for Unreal Situations 18:25
"If she had gone to university, she would have found a really good job."
- The third conditional deals with unreal situations in the past, which means the outcome did not happen. In this case, "If she had gone to university, she would have found a really good job" suggests that because she did not attend university, she likely missed out on a good job opportunity. This construction utilizes the past perfect tense to express the unreal past.
The Zero Conditional: General Truths 19:58
"If it snows, traveling is more difficult."
- The zero conditional is employed for general truths and present facts. The statement "If it snows, traveling is more difficult" indicates a situation that is usually true under the specified condition. This uses the present simple tense for both the condition and the result, highlighting its consistent nature.