I just looked out of the window - truth
I can hear a TV on downstairs - truth
Just ate an egg and bacon sandwich - truth
1 + 1 = 2 - Truth
A square's area can be worked out by multplying the lengths of 2 sides together - truth
Cat is spelled Cat in the english dictionary - truth
England is a country - truth
Good try, but one might posit alternatives that render your 'truths' either undecided, or even false.
Can you be 100% certain that your TV is in fact downstairs? Perhaps someone has stolen it and replaced it with a tape recorder emitting a recording of a television?
Perhaps your sandwich was a piece of paper that due to a temporary delusional state, you mistook for food?
1+1=2, print it on a piece of paper, show it to a Mongolian teenager and ask if it is true, the probable reply would not be unequivable.
As for the square what if one side is marked out in inches, and the other in centimeters?
Cat=Cat, as a tautology it is most probably true, but you can't exclude the possibility of a dictionary that completely omits the word, rendering your argument false.
England is a country? Any truth value here is due to convention, so one might say you are showing the convention to be true, not the statement, one might argue that the proper appellation is nation state, or Kingdom.
In fact how can you be certain of any of these truths. Perhaps you have just entered a simulation whilst your body and brain lie in a universe completely at odds to our own. Perhaps you are but a brain in a jar, hooked up to a supercomputer that feeds you sensory information, all of which it knows to be untrue?
