Okay, help for the negatives is here!!!

1NC (that's the first negative speaker's opening speech)

You have a few different ways to go here. You could say that the PROBLEM IS SMALL, there isn't really a problem (no achievement gap? no harassment problems? test scores are fine? OR you could say the SOLUTION WILL NOT WORK or even better THE SOLUTION WILL MAKE THE PROBLEM WORSE. Finally you should list ADDITIONAL PROBLEMS THAT WILL BE CREATED if we choose single sex schools.

I recommend you divide your ideas into different paragraphs.

For example:
Paragraph 1 (blue and green only)
Short, stating that we should not have single sex schools. Briefly summarizing why, summarizing your yellows, but with no evidence (reds).

Paragraph 2: First yellow with all the reds
The PROBLEM that people are trying to address is that girls don't achieve as well in schools, right? Well, the evidence shows that girls are actually achieving better than boys these days. So, you could write "insert evidence here that shows there is no reason to have a single sex school because girls are doing as well as or better than boys" Also, show that single sex schools will not solve the problem, even if there was one. Research! You must have research that shows that single sex schools don't in fact help scores or improve bullying or whatever. Don't worry if you don't have that evidence tonight. Just leave a space for where you will eventually insert the evidence.

Paragraph 3: Second yellow with all the reds
Could be that you think it is illegal. Provide all the evidence from the 14th amendment, Brown v Board of Education, and the Virginia Military Institute case. When you write it tonight just leave a section that says "insert more evidence about court cases here"

Paragraph 4:
In this paragraph, you're going to argue that not only will the single sex schools not solve the problem, they will make it worse. Find quotes that suggest this. Divisive?? Prove it. (AGain, remember you can leave out the reds if you can't find them tonight. Just leave a spot that says "insert evidence or examples here"

Paragraph 5:
Restate your original reasons. I have shown that not only will single sex schools not help, they will actually make it worse (not exactly that, but in your words and with a summary of the research)