Write down the converse of following statement: If $S$ is a cyclic quadrilateral, then the opposite angles of $S$ are supplementary.

Write down the converse of following statement: If $x=0$ then $x$ is neither positive nor negative.

Write down the converse of following statement: If two triangles are similar, then the ratio of their corresponding sides are equal.

Identify the Quantifiers in the following statements. "There exists a triangle which is not equilateral".

Identify the Quantifiers in the following statement. For all real numbers $x$ and $y, xy=yx.$

Identify the Quantifiers in the following statements.There exists a real number which is not a rational number.

Identify the Quantifiers in the following statement.

For every natural number $x, x+1$ is also a natural number.

Identify the Quantifiers in the following statement. For all real numbers $x$ with $x>3,$ $x^2$ is greater than $9.$

Identify the Quantifiers in the following statement. "There exists a triangle which is not an isosceles triangle".