Write the negation of the following statements:
(i) New Delhi is a city
(ii) Everyone in Germany speaks German
(iii) √7 is rational
(iv) Chennai is the capital of Tamil Nadu
(v) √2 is not a complex number
(vi) All triangles are not equilateral triangle
(vii) The number 2 is greater than 7.
(viii) Every natural number is an integer.