SN4 ""

No	Pattern	Freq
1	be [adv] difficult	636
2	be [adv] difficult	636
3	be very difficult	227
4	be very difficult	227
5	be more difficult	120
6	be more difficult	120
7	be extremely difficult	62
8	be extremely difficult	62
9	be too difficult	48
10	be too difficult	48
11	be quite difficult	35
12	be quite difficult	35
13	be so difficult	23
14	be so difficult	23
15	be as difficult	14
16	be as difficult	14
17	be particularly difficult	14
18	be particularly difficult	14
19	be that difficult	7
20	be that difficult	7
21	be rather difficult	7
22	be rather difficult	7
23	be increasingly difficult	6
24	be exceedingly difficult	6
25	be increasingly difficult	6
26	be exceedingly difficult	6
27	be equally difficult	5
28	be equally difficult	5
29	be extraordinarily difficult	5
30	be especially difficult	5