Using 'Whether' and 'If' Correctly

This video tutorial explains the differences and similarities between using 'whether' and 'if' in English. It covers situations where these words are interchangeable, when 'if' is used in conditional sentences, and when 'whether' is used for presenting two options. The video also discusses grammatical rules for using 'whether' before infinitives and after prepositions, and highlights the expression 'whether or not' to indicate disregard for options. Examples are provided throughout to illustrate these concepts.

What is the main focus of the lesson introduced in the video?

• The use of 'but' and 'however'

• The difference between 'whether' and 'if'

• The use of 'and' and 'or'

• The difference between 'can' and 'may'

In which situation can 'whether' and 'if' be used interchangeably?

• When presenting two options

• When used after a preposition

• When expressing a condition

• When the meaning of the sentence does not change

Which sentence correctly uses 'if' in a conditional context?

• I'm thinking about if to accept the job.

• If it rains tomorrow, I will stay at home.

• I don't know if he prefers tea or coffee.

• I wonder if to go to university.

When should 'whether' be used instead of 'if'?

• In conditional sentences

• When there are two known options

• After a preposition

• Before an infinitive

Which sentence correctly uses 'whether' before an infinitive?

• Our plans depend on if it is hot.

• Have you decided whether to go to university?

• I don't know if to ask him.

• I'm thinking about if to accept the job.

What is the difference between 'let me know whether you need help' and 'let me know if you need help'?

• Neither is correct.

• Both mean the same thing.

• 'If' asks for a yes or no answer, 'whether' is conditional.

• 'Whether' asks for a yes or no answer, 'if' is conditional.

What does the expression 'whether or not' imply?

• It means regardless of the options.

• It indicates a condition.

• It is used before an infinitive.

• It presents two options.