Teacher: We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.
Teacher: Now, understand the problem? If you are still confused, see the following example:
It is usually just as religiously important to same-sex couples to be married as it is for opposite-sex couples, and no one should be able to tell those people that the government cannot recognize their relationship.
Solution: Valid
Reason: It is a clear argument that supports gay marriage by saying it is as religiously important as opposite-sex marriage.

Now, solve this instance: Gay marriage is wrong the reason is because in every definition of marriage it includes man and woman not man and man or women and women it is women and man.
Student:
Valid