SimilarityRank
be_a_tough 0.779 36164
tough 0.747 4367
it_be_tough 0.741 29779
be_very_hard 0.681 91214
it_be_a_tough 0.677 93393
it_be_not_easy 0.657 29647
be_very_difficult 0.650 37607
a_tough 0.644 26323
be_not_easy 0.642 17254
hard 0.605 1452
it_be_hard 0.602 12868
difficult 0.602 2515
be_tricky 0.600 48836
can_be_hard 0.594 97851
very_hard 0.586 41193
really_hard 0.583 64966
it_be_difficult 0.579 31149
be_difficult_for 0.577 52554
be_extremely_difficult 0.577 97037
a_difficult 0.571 12053
be_hard_to 0.567 23656
not_easy 0.559 65092
be_the_most_difficult 0.558 91080
get_hard 0.552 65510
be_not_always_easy 0.551 89460