vs 

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"Tú" is a form of "tú", a pronoun which is often translated as "you". "No es cierto" is a form of "no es cierto", a phrase which is often translated as "it's not true". Learn more about the difference between "tú" and "no es cierto" below.
(
too
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
1.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(second person singular)
a. you
Yo, como tú, tengo que trabajar mañana.I, like you, have to work tomorrow.
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no es cierto(
noh
 
ehs
 
syehr
-
toh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. it's not true
No es cierto que no quiera ayudarte, es solo que no puedo.It's not true that I don't want to help you. It's just that I can't.
b. it is untrue
Por mucho que diga el gobierno, no es cierto que hayamos salido de la crisis.Whatever the government says, it is untrue that the crisis is over.
c. that's not true
Es que sales todas las noches. - ¡No es cierto! Ayer no salí.The thing is that you go out every night. - That's not true! I didn't go out yesterday.
a. don't you think
Hoy hace mucho más frío que ayer, ¿no es cierto?Today it's much colder than yesterday, don't you think?
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Este niño cada día está más alto, ¿no es cierto?This boy grows taller every day, doesn't he?
Cuando él murió, ella se volvió a casar, ¿no es cierto?When he died, she married again, didn't she?
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