SN4 ""

No	Pattern	Freq
1	it is [adv] difficult for	78
2	it is [adv] difficult for	75
3	it is very difficult for	23
4	it is very difficult for	23
5	it is more difficult for	10
6	it is more difficult for	10
7	it is extremely difficult for	9
8	it is extremely difficult for	9
9	[conj] it is difficult for	44
10	[that] it is difficult for	16
11	that it is difficult for	16
12	that it is difficult for	16
13	[coord] it is difficult for	15
14	[subord] it is difficult for	13
15	and it is difficult for	11
16	and it is difficult for	11
17	[noun] it is difficult for	8
18	[noun sg] it is difficult for	7
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