SN4 ""

No	Pattern	Freq
1	[conj] it is difficult for	44
2	[that] it is difficult for	16
3	that it is difficult for	16
4	that it is difficult for	16
5	[coord] it is difficult for	15
6	[subord] it is difficult for	13
7	and it is difficult for	11
8	and it is difficult for	11
9	[noun] it is difficult for	8
10	[noun sg] it is difficult for	7
11	it is [adv] difficult for	78
12	it is [adv] difficult for	75
13	it is very difficult for	23
14	it is very difficult for	23
15	it is more difficult for	10
16	it is more difficult for	10
17	it is extremely difficult for	9
18	it is extremely difficult for	9
19	it is difficult [verb] for	13
20	it is difficult [to-vb] for	13
21	it is difficult account for	6
22	it is difficult to account for	6
23	it is difficult for [pron]	57
24	it is difficult for [pers pn]	49
25	it is difficult for [art]	31
26	it is difficult for [art]	31
27	it is difficult for [noun]	28
28	it is difficult for [adj]	21
29	it is difficult for [noun pl]	20
30	it is difficult for the	19