Question

Primeiro mude para a forma negativa e, então, para a forma interrogativa:
This is the echo of my voice
The books are on the shelf
This word is correct
That is my watch
Life is beautiful

Answer 1

Affirmative: This is the echo of my voice. 
Negative: This is not the echo of my voice. 
Interrogative: Is this the echo of my voice?

Affirmative: The books are on the shelf. 
Negative: The books are not on the shelf. 
Interrogative: Are the books on the shelf?

Affirmative: This word is correct.
Negative: This word is not correct.
Interrogative: Is this word correct?

Affirmative: That is my watch.
Negative: That is not my watch.
Interrogative: Is that my watch?

Affirmative: Life is beautiful.
Negative: Life is not beautiful.
Interrogative: Is life beautiful?


Nas frases negativas, pode se utilizar as formas contractas "isn't" e "aren't" correspondentes a, respectivamente, "is not" e "are not".