SN4 ""

No	Pattern	Freq
1	[adv] difficult it	216
2	[Wh adv] difficult it	159
3	how difficult it	152
4	how difficult it	152
5	[adv] difficult it	56
6	more difficult it	48
7	more difficult it	48
8	however difficult it	7
9	however difficult it	7
10	[is] difficult it	5
11	be difficult it	5
12	[be] difficult it	5
13	difficult [conj] it	93
14	difficult [subord] it	78
15	difficult [verb] it	62
16	difficult [to-vb] it	60
17	difficult than it	24
18	difficult than it	24
19	difficult as it	23
20	difficult as it	23
21	difficult because it	14
22	difficult because it	14
23	difficult [prep] it	13
24	difficult [prep] it	13
25	difficult [coord] it	12
26	difficult [be] it	10
27	difficult and it	10
28	difficult and it	10
29	difficult be it	10
30	difficult is it	7