Understanding 'If' vs 'Whether' in GMAT

This lesson explains the difference between using 'if' and 'whether' in sentences, particularly in the context of the GMAT. It highlights that 'if' is used for conditional sentences, while 'whether' is used to show two alternatives. The lesson provides examples and explains how reversing the order of a true conditional sentence should still make sense. It concludes with a note that these rules are specific to the GMAT and not universally accepted.

What is the main difference between 'if' and 'whether' as discussed in the introduction?

• 'If' is informal, 'whether' is formal.

• 'If' is for conditional sentences, 'whether' for alternatives.

• 'If' is used in past tense, 'whether' in future tense.

• 'If' is used for questions, 'whether' for statements.

In GMAT, when should you use 'if'?

• When listing options.

• When stating a fact.

• When expressing a condition.

• When asking a question.

What happens when you reverse a true conditional sentence with 'if'?

• It becomes incorrect.

• It still makes sense.

• It loses its meaning.

• It becomes a question.

Why is 'Sue doesn't know if she passed the test' incorrect?

• It is a question, not a statement.

• It uses 'if' instead of 'whether'.

• It is missing a subject.

• It is in the wrong tense.

What is the correct form of 'Serita cannot remember if she paid the phone bill'?

• Serita cannot remember whether she paid the phone bill.

• Serita cannot remember if she has paid the phone bill.

• Serita cannot remember whether she has paid the phone bill.

• Serita cannot remember if she paid the bill.

Which sentence correctly uses 'if'?

• The system doesn't work whether people participate.

• The system doesn't work whether people don't participate.

• The system doesn't work if people don't participate.

• The system doesn't work if people participate.

What is emphasized in the conclusion about the rules discussed?

• They are informal guidelines.

• They are specific to GMAT.

• They are universally accepted.

• They are outdated.