We make statements like "This table is composed from atoms". This statement must be true or false. But what if tomorrow the atomic theory is completely abandoned and we work with another theory where the concept of "atom" isn't contained. Would the statement now be true or false? If it is false then this clearly shows that the statements depend on what model/theory we adopt.
Example 1 Here is a link for the definition of sea from Wikipedia. Suppose that one day suddenly all the salt from all the "seas" disappear (but nothing else change). Now would it make sense to say for example "A shark swims in the sea"? This contradicts our notion of "pictorial" (I don't know the technical term) understanding of what "sea" means. Even if nobody knew that all the salt went off just by looking he can see that "A shark swims in the sea". Now is this statement true or false?
Example 2 Suppose someone is asked to answer the following question. "We have a box with 2 oranges. Now we add other 3 oranges. How many oranges we have? Would it matter if we added had initially 3 oranges and then added 2?" If he answers, "Look it depends if the real world works like maths do, i.e. the commutative property works etc", I think everyone will laught at him. We haven't find a single example where the maths doesn't work in real world. But this doesn't mean we won't find. And of course this doesn't mean that math don't work if we find one. But when we make statements we use theories or maths in order to evaluate their truth value. Why we do that if the statements should be evaluated only according to real world?