What exactly is Whether? Distinguishing Whether or and Whether or not

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1.

What does the conjunction 'whether' mean in English?

In English, 'whether' is a conjunction that expresses doubt or a choice between two possibilities. It is used to show uncertainty or to indicate that something is true in either case.
2.

How is the structure 'whether or not' used in sentences?

The structure 'whether or not' implies a necessity to do something regardless of the subject's preference. For example, 'Whether you leave or not, you have to pay for the drink.'
3.

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

Use 'whether' instead of 'if' when a preposition follows or before an infinitive verb. For example, 'She talked about whether to go out later' or 'I wonder whether to eat cookies or ice cream.'
4.

How is 'whether' used in noun clauses?

'Whether' is used in noun clauses to indicate uncertainty or to introduce indirect questions. For example, 'Lisa wonders whether her parents need help' or 'Whether they won the competition is unsure.'
5.

What is the difference between 'whether' and 'if' in indirect questions?

Both 'whether' and 'if' can be used in indirect questions. However, 'whether' is preferred when expressing a choice between two options or when followed by a preposition, like in 'He asked me whether I was coming.'