#### Answer

Converse: In a plane, if two lines are not parallel, then these lines are not perpendicular to the same line. (true)
Inverse: In a plane, if two planes are perpendicular to the same line, then these lines are perpendicular. (true)
Contrapositive: In a plane, if two lines are parallel, then these lines are perpendicular to the same line. (true)

#### Work Step by Step

Switch the hypothesis and conclusion for the converse. Negate the hypothesis and conclusion for the inverse. Switch and negate the hypothesis and conclusion for the contrapositive.