Whether vs. That
Parts of Speech
'Whether' and 'that' are conjunctions. They are used to connect clauses together.
Example
We need to check whether he is home or not.
We need to check that he is home or not.
Meaning
We can 'whether' and 'that' to express alternatives and conditions. Have a look:
Example
I'm not sure whether this is correct.
I know that this is correct.
As you can see in the examples above, 'whether' and 'that' can be used as conjunctions. However, 'that' is used when there is a certainty. In other words, when we are sure about a condition or alternative, we use 'that.' Conversely, 'whether' is used when there is doubt about the condition or alternative.
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