SN4 ""

No	Pattern	Freq
1	[pron] be often difficult [to-vb]	78
2	[pers pn] be often difficult [to-vb]	76
3	it be often difficult [to-vb]	72
4	it be often difficult [to-vb]	72
5	[noun] be often difficult [to-vb]	38
6	[noun pl] be often difficult [to-vb]	22
7	[noun sg] be often difficult [to-vb]	16
8	[adj] be often difficult [to-vb]	5
9	be often [adv] difficult [to-vb]	22
10	be often [adv] difficult [to-vb]	21
11	be often very difficult [to-vb]	11
12	be often very difficult [to-vb]	11
13	be often difficult [to-vb] [prep]	33
14	be often difficult [to-vb] [prep]	33
15	be often difficult [to-vb] [art]	21
16	be often difficult [to-vb] [art]	21
17	be often difficult [to-vb] the	16
18	be often difficult [to-vb] the	16
19	be often difficult [to-vb] [adv]	14
20	be often difficult [to-vb] [conj]	14
21	be often difficult [to-vb] [adj]	11
22	be often difficult [to-vb] [subord]	11
23	be often difficult [to-vb] from	9
24	be often difficult [to-vb] [adv]	9
25	be often difficult [to-vb] from	9
26	be often difficult [to-vb] [pron]	7
27	be often difficult [to-vb] on	6
28	be often difficult [to-vb] [adj]	6
29	be often difficult [to-vb] [noun]	6
30	be often difficult [to-vb] whether	6