SN4 ""

No	Pattern	Freq
1	[noun] [coord] it is difficult	50
2	[noun sg] [coord] it is difficult	24
3	[noun pl] [coord] it is difficult	19
4	[verb] [coord] it is difficult	8
5	[adj] [coord] it is difficult	8
6	[adj] [coord] it is difficult	6
7	[adv] [coord] it is difficult	5
8	[adv] [coord] it is difficult	5
9	[coord] [conj] it is difficult	13
10	[coord] [adv] it is difficult	10
11	[coord] [adv] it is difficult	10
12	[coord] that it is difficult	7
13	[coord] that it is difficult	7
14	[coord] [that] it is difficult	7
15	[coord] [subord] it is difficult	6
16	[coord] it is [adv] difficult	98
17	[coord] it is [adv] difficult	82
18	[coord] it is very difficult	34
19	[coord] it is very difficult	34
20	[coord] it is not difficult	16
21	[coord] it is not difficult	16
22	[coord] it is [not/n't] difficult	16
23	[coord] it is often difficult	10
24	[coord] it is often difficult	10
25	[coord] it is more difficult	6
26	[coord] it is more difficult	6
27	[coord] it is extremely difficult	5
28	[coord] it is extremely difficult	5
29	[coord] it is difficult [verb]	161
30	[coord] it is difficult [to-vb]	160