Which of these are correct uses of "then"?

[thirtythree]

I ate, and then I pooped.
I ate then pooped.
I ate and then pooped.
I ate. Then I pooped.
I ate. Then, I pooped.

All okay? I'm mostly never sure whether there should be an "and" before it or not.

 

[yhelothar]

My grammar is better then yours.


Anyways, I believe #1 and #5 are the correct ones.

 

[Adica]

I ate, and then I pooped.

 

[Xyclone]

I ate, then pooped.

 

[Bozono]

This thread has to be a joke. :Q

 

[Xyclone]

My reply is correct, give me my and :beer:!

 

[DaFinn]

I vote for Poo pooby doo...