# The author uses the word "immediacy" (line 39) most likely in order to express

SeonAh on September 21, 2019

Question 4

In the video, it is said that there is no sufficient and necessary indicators in the last sentence. Why do we not diagram either/or in the last sentence? When do we know to leave it out?

Replies

Skylar on September 21, 2019

@SeaonAh-Lee Maybe I can help.

Until you become familiar with extracting the pure logic from arguments, it can be tricky to determine when to diagram statements and when it is unnecessary or ineffective to do so. In this case, the terms "either/or" in the last sentence do not need to be diagrammed. They do not play a critical role in the argument, nor are they playing active roles in the sentence. In other words, the sentence would mean the same thing if it simply read "goods were traded for money or commodities." There is nothing meaningful to diagram here.

However, if the sentence were to read something like "If.....then either __ or __ ," or something like "either ___ or ___ must act in this way," you will likely want to diagram it. Also, if "either/or" is ever mentioned in a rule in a logic game, you should diagram it.

Does this make sense? Please let us know if you have any other questions!

SeonAh on September 22, 2019

Makes more sense. I will try it out!

I have one more question regarding indicators.

Is the word since a sufficient or necessary indicator?

Iâ€™ve seen a lot of â€œsinceâ€s in the practice questions (sufficient & necessary questions) but Iâ€™m not sure how to diagram it.

Skylar on October 13, 2019

@SeonAh-Lee We usually see the word "since" introducing a premise for an argument's conclusion. In some cases, it may be possible for "since" to be used to introduce an S->N statement, but be careful not to assume that it always does.