What is the difference between that and if?
I don’t know that/if I prefer that to this.
Thank you
This is an interesting question for a native speaker, and hard to answer. The meaning is approximately the same: "I don't know my preference in this situation. " If there is a difference it is a fine nuance.
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This is an interesting question for a native speaker, and hard to answer. The meaning is approximately the same: "I don't know my preference in this situation. Is it for that or for this?" If there is a difference it is a fine nuance. For example:
With "if," the given sentence sounds like a standard question: the speaker is not sure of his preference in this situation.
[1] I don’t know that I prefer that to this.
[2] I don’t know if I prefer that to this.
The meanings are similar, but the grammar of the underlined elements is different.
In [1] it is a declarative content clause, where the meaning is similar to I'm not sure that I (do) prefer that to this.
In [2] it is a subordinate interro