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difficult as difficult more difficult most difficult
too; to very; that so; that very; but
too; to very; that so; that very; but
much difficult more difficult much more difficult the most difficult
few a few little a little
for us to work out for us to work out it for us to work it out that we can’t work it out
harder; less hardier; fewer more hardly; fewer harder; fewer
easy difficult familiar simple
as difficult than so difficult as as more difficult as as difficult as
if necessary if any if so if possible
can ' t, must can ' t, need can, may mustn't, can
so; that such; that such; as so; as
few a few little a little
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