关于assumption题取非的一个疑问！！

For NECESSARY assumption, if you negate the correct answer, the argument 完全不能成立

For SUFFICIENT assumption, negation method won't work.

Both Necessary Assumption and Sufficient Assumption questions contain the word "assumption", but they ask for different things. So how could you tell the difference?

FOCUS on the verb in the question stem.

Necessary Assumption questions often contain the words:

1) Depend
Example #1: "Which one of the following is an assumption that the manager's argument depends on?"

Example #2: "Which one of the following is an assumption on which the argument depends for its conclusion to be properly drawn?"

2) Require
Example: "Which one of the following is an assumption the President's argument requires?"

Example: "Which one of the following is an assumption required by the dietitian's argument?"

3) Rely
Example: "Which one of the following is an assumption on which the argument relies?"

The following three are significantly less common:

4) Necessary
Example: "Which one of the following is an assumption necessary for the critic's conclusion to be properly drawn?"

"Assumes"

Sufficient Assumption questions often contain the following words:

1) Follow logically if something is assumed
Example #1: "The argument's conclusion follows logically if which one of the following is assumed?"

Example #2: "The critic's conclusion logically follows if which one of the following is assumed?"

2) Properly inferred if something is assumed
Example: "Which one of the following, if assumed, allows the conclusion of the doctor's argument to be properly inferred?"

3) Properly drawn if...assumed
Example: "The argument's conclusion is properly drawn if which one of the following is assumed?"

4) Enable
Example: "Which one of the following, if assumed, enables the conclusion of the argument to be properly drawn?"

5) Allows
Example: "Which one of the following is an assumption that would allow the conclusion above to be properly drawn?"

6) Justifies
Example: "Which one of the following is an assumption that would serve to justify the conclusion above?"