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Considering following sentences.
Questions:
Is it formal? if no how does formal one look like?
Is it possible to use "that" instead of "if"? the difference?
When should I use this form? and is there any other way to say it?
Thanks in advance :)
1. Is it formal?
It doesn't sound especially formal to me.
2. if no how does formal one look like?
I would use whether to make it sound formal:
3. Is it possible to use "that" instead of "if"?
As StoneyB points out that doesn't work because of or.
4. the difference? When should I use this form? and is there any other way to say it?
Use if or whether if you want to present a list of possibilities:
Use that if you want to present only one possibility:
There’s no a ‘conditional if’ (it does not introduce a subordinate conditional clause) in your examples, so you may replace it with ‘that’ or ‘whether’.
Vice versa is not possible, you cannot use ‘whether’ when there is a conditional clause.
The word 'that' probably does not suit there. What about thinking of some better option, the word whether? The reason is, when we have two alternatives, a sentence is better described with whether.
In your examples, neither of those two parts is conditional. For instance, your fast walking does not depend on the other clause and vice versa.
We use if if the sentence is conditional.
More information here.
Broadly, that describes, if puts a condition, and whether gives options.
