Collocations for comprehend - verb

fully
barely
She could barely comprehend what was happening to her.

easily

be able to, be unable to
cannot, fail to
She failed to comprehend the seriousness of the situation.

be difficult to, be impossible to
It is difficult to comprehend how far away the stars are.

Comprehend is used with these nouns as the object:
intricacy, magnitude, meaning, nature, scale, situation, workings