What is a 'true sentence'?

Answer 1

If you are asking 'What is a sentence', the answer is that every sentence has two components, a subject and a predicate. Any statement that is lacking one of these is not a sentence. Sometimes the subject is understood rather than expressed. Go to school. The subject is understood to be 'you', even though it is not written. 'Go to school' is a sentence. Some sentences can be very complex, but you will always find the subject and the predicate if it is indeed a sentence.

If you are asking 'What is a true statement', the answer is obvious, although many examples will be debatable. A statement that reflects and affirms some widely or universally held reality, or that can be verified by objective and agreed upon evidence, is a true statement. Potable water is necessary to maintain human life. This is a true statement that few would argue against. In other cases, truth or falsity is less clear, and is sometimes controversial to the point of armed conflict.

[Note: "A statement that reflects and affirms some widely or universally held reality, or that can be verified by the evidence." This is NOT a sentence; there is no predicate. Note that it is different from the sentence above.]