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## What does equivalent mean in logic?

In logic and mathematics, statements and are said to be logically equivalent if they are provable from each other under a set of axioms, or have the same truth value in every model. The logical equivalence of and is sometimes expressed as , , , or. , depending on the notation being used.

## What’s the difference between Converse inverse and Contrapositive?

The converse of the conditional statement is “If Q then P.” The contrapositive of the conditional statement is “If not Q then not P.” The inverse of the conditional statement is “If not P then not Q.”

## What conditional means?

(Entry 1 of 2) 1 : subject to, implying, or dependent upon a condition a conditional promise. 2 : expressing, containing, or implying a supposition the conditional clause if he speaks. 3a : true only for certain values of the variables or symbols involved conditional equations.

## What are the two parts of a conditional sentence?

There are always two parts to a conditional sentence – one part beginning with ‘if’ to describe a possible situation, and the second part which describes the consequence.

## How is a conditional structured?

Notice the correct way to structure second conditional sentences is to use the simple past tense in the if-clause and an auxiliary modal verb (e.g., could, should, would, might) in the main clause (the one that expresses the unrealistic or unlikely outcome).

## What is the example of first conditional?

First conditional is used to talk about actions/events in the future which are likely to happen or have a real possibility of happening. If it rains tomorrow, I’ll stay at home. If my father doesn’t buy me a bike for my birthday, I will be very unhappy.

## What are the examples of second conditional?

The Second Conditional

• If I won the lottery, I would buy a big house.(I probably won’t win the lottery)
• If I met the Queen of England, I would say hello.
• She would travel all over the world if she were rich.
• She would pass the exam if she ever studied.(She never studies, so this won’t happen)

## How is first conditional formed?

The first conditional in English is formed with the present simple after “if” while the second clause uses the future simple. If + present simple, will + verb (in infinitive). The negative structure is: If + do/does not + present simple, will + verb (in infinitive).

## What is the pattern for first conditional sentences?

In first conditional sentences, the structure is usually: if/when + present simple >> will + infinitive. It is also common to use this structure with unless, as long as, as soon as or in case instead of if. I’ll leave as soon as the babysitter arrives.