A
Mary draws a lot. She likes art.
Mary draws a lot,as she likes art. Reason.
Let's leave now. Let's leave after lunch.
Let's leave now, or after lunch.
I need to rake. Then I need to mow.
I need to rake and mow. Agreement.
I do not work hard. I do not make good grades.
I do not work hard, so I do not make good grades. Reason.