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can it can’t it can they can’t they
difficulty in learning difficulty to learn difficulties learned difficulties to learn
face them bravely and try to overcome them. neglect them and come up with a new goal. be unwilling to admit there are some difficulties. worry about them and feel discouraged or frustrated.
many difficulties many difficulty much difficulties much difficulty
having compared to comparing to compare to compared to
Everything Anything Nothing Something
difficulty in learning difficulty to learn difficulties learned difficulties to learn
He is depressed because of the ignorance of scientists. He is doubtful because of the enormous difficulties in scientific research. He is confident though he is aware of the enormous difficulties in scientific research. He is delighted because of the illuminating scientific findings.
no difficulties to find some difficulties in finding no difficulty to find no difficulty in finding
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