SN4 ""

No	Pattern	Freq
1	it be difficult [verb] for	14
2	it be difficult [to-vb] for	14
3	it be difficult to account for	6
4	it be difficult account for	6
5	it be difficult [adv] for	5
6	it be difficult [adv] for	5
7	[conj] it be difficult for	63
8	that it be difficult for	25
9	[that] it be difficult for	25
10	that it be difficult for	25
11	[coord] it be difficult for	20
12	[subord] it be difficult for	18
13	and it be difficult for	15
14	and it be difficult for	15
15	[verb] it be difficult for	10
16	[noun] it be difficult for	9
17	[noun sg] it be difficult for	8
18	[adv] it be difficult for	7
19	[adj] it be difficult for	5
20	but it be difficult for	5
21	but it be difficult for	5
22	[pron] it be difficult for	5
23	[adv] it be difficult for	5
24	[Wh det] it be difficult for	5
25	[adj] it be difficult for	5
26	it [vb mod] be difficult for	80
27	it [modal v] be difficult for	80
28	it would be difficult for	26
29	it would be difficult for	26
30	it will be difficult for	20