SN4 ""

No	Pattern	Freq
1	[pron] can be [adv] difficult	52
2	[pers pn] can be [adv] difficult	48
3	it can be [adv] difficult	46
4	it can be [adv] difficult	46
5	[noun] can be [adv] difficult	36
6	[noun sg] can be [adv] difficult	20
7	[noun pl] can be [adv] difficult	14
8	[adj] can be [adv] difficult	8
9	[det] can be [adv] difficult	6
10	can [adv] be [adv] difficult	5
11	can [adv] be [adv] difficult	5
12	can be [art] [adv] difficult	10
13	can be [art] [adv] difficult	10
14	can be a [adv] difficult	9
15	can be a [adv] difficult	9
16	can be [adv] difficult [verb]	52
17	can be [adv] difficult [to-vb]	51
18	can be [adv] difficult [prep]	15
19	can be [adv] difficult [prep]	15
20	can be [adv] difficult for	13
21	can be [adv] difficult for	13
22	can be [adv] difficult [conj]	8
23	can be [adv] difficult [subord]	5