SN4 ""

No	Pattern	Freq
1	[conj] it be difficult	735
2	[coord] it be difficult	343
3	[subord] it be difficult	197
4	that it be difficult	195
5	that it be difficult	195
6	[that] it be difficult	195
7	[noun] it be difficult	191
8	and it be difficult	174
9	and it be difficult	174
10	but it be difficult	169
11	but it be difficult	169
12	[noun sg] it be difficult	134
13	[adv] it be difficult	133
14	[adv] it be difficult	106
15	[verb] it be difficult	87
16	[noun pl] it be difficult	48
17	[vb base] it be difficult	45
18	although it be difficult	44
19	although it be difficult	44
20	[adj] it be difficult	43
21	[pron] it be difficult	38
22	[Wh det] it be difficult	30
23	which it be difficult	29
24	which it be difficult	29
25	because it be difficult	28
26	because it be difficult	28
27	as it be difficult	27
28	as it be difficult	27
29	know it be difficult	22
30	[adj] it be difficult	22