SN4 ""

No	Pattern	Freq
1	[verb] [adv] difficult it be [prep]	22
2	[vb base] [adv] difficult it be [prep]	8
3	know [adv] difficult it be [prep]	6
4	know [adv] difficult it be [prep]	6
5	[vb past] [adv] difficult it be [prep]	5
6	[adv] difficult it [vb mod] be [prep]	6
7	[adv] difficult it [modal v] be [prep]	6
8	[adv] difficult it be [verb] [prep]	13
9	[adv] difficult it be [to-vb] [prep]	8
10	[adv] difficult it be [v-ing] [prep]	5
11	[adv] difficult it be go [prep]	5
12	[adv] difficult it be going [prep]	5
13	[adv] difficult it be [prep] [noun]	13
14	[adv] difficult it be [prep] [pron]	10
15	[adv] difficult it be [prep] [pers pn]	10
16	[adv] difficult it be [prep] [noun pl]	8