(∀y: Qy) ¬ (∀x: Sx) Axy
for A: [ _ answered _ ]; Q: [ _ is a question]; S: [ _ is a source]

(∀y: y is a question) ¬ (∀x: x is a source) x answered y

(∀y: y is a question) ¬ every source is such that (he or she answered y)

(∀y: y is a question) ¬ every source answered y      

alternative 1:

No question is such that (every source answered it)

? Every source answered no questionNo question was answered by every source     

alternative 2:

(∀y: y is a question) not every source answered y

Every question is such that (not every source answered it)

? Not every source answered every questionany question

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