Is that the whole truth?

is Verb

— A form of the verb be when talking about someone or something else. He is late for class. Is it hot in here?

that Determiner

— Used to show which thing we are talking about; used with things that are not close to the speaker. Give me that book, not this one. Give me that, not this. That dog is hungry.

that Subordinator

— used to link a subordinate clause to a main one You said that you liked me. Give me the book that I dropped.

the Determiner

— Used, instead of a, to reference something specific, already known to exist. Compare "I read a book." and "I read the book." — Used with a stress, to show that the word following is special. Are you the John Smith that I went to school with? — Used with an adjective that acts like a noun to mean all of the people concerned The poor are always with us. — Used with superlatives forms of adjectives and adverbs. You are the best.

whole Adjective

— Whole is used to describe every part of an object. I ate the whole meal, leaving nothing left.

whole Noun

— The whole of something means the entire part of it. The whole of the Middle East is pretty messy at the moment.

truth Noun

— The truth is an idea which is correct or accepted as correct. Don't lie to me. Tell me the truth. There is no absolute truth in history. Sometimes, truth is stranger than fiction. The honest truth is, we made a lot of mistakes on this job.