# Let’s start with finding premises and conclusions. For the next few arguments, state what the premise is and what the conclusion is. Remember, you could have more than one premise and it may not be the first statement. You will only have one conclusion. This exercise is graded.

• For the following arguments, determine what statement is the conclusion and what statement/s are the premises. You may state it or underline it. Don’t forget to look for indicator words as they will signal a conclusion or the premises. The next exercise, find the missing statement based on identification of the form.

## 6. The fact that there was never a land bridge between Australia and mainland Asia is evidenced by the fact that the animal species in the two areas are very different. Asian placental mammals and Australian marsupial mammals have not been in contact in the last several million years. (Price and Feinman, Images of the Past)

• Now try to find the missing premise or conclusion by way of the forms, either valid or invalid, that you learned. Write it into the blank and tell us what form it fulfills.

1) All bachelors are unmarried men.

Ed is a bachelor.

Therefore, _______________________________

2) If you are rich then I am single.

________________________________

You are not rich.

3) All teachers work hard.

_______________________________

All teachers pay taxes.

4) Either today is Tuesday or it is Wednesday.

___________________________________

Today is Tuesday.

Exercises from S. Kelly, Thinking Well, an Introduction to Critical Thinking, and Patrick Hurley, A Concise Introduction to Logic.