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.

I believe you will see a major sociological shift in opinion on many social issues as the baby boomers die off and the curent young generations age.
Valid

If there are cases where we can not determine what sex a person is, how can we determine if they are homosexual or not?
Valid

Now a gay man may not wish to marry a gay woman (or vice versa) but the government does not inherently prohibit marriage between gay persons.

Valid