It is snowing and the wind is blowing. Either it is snowing or the wind is blowing. It is snowing. If it is snowing, then it will be hard to drive. Stronger claims are harder to prove, easier to disprove.
Weaker claims are easier to prove, harder to disprove.
Longer arguments get constructed out of simpler patterns. We indicate this when we talk about there being steps in an argument. Much of this course will be concerned with getting to know the basic patterns, learning how to find them, how to string them together, and also the ways in which they can go wrong. Arguments that do not offer deductively sound patterns may still offer some support for their conclusions. In this case the forms are more varied and harder to classify, but there are still some guidelines available.