SN4 ""

No	Pattern	Freq
1	[conj] it [verb] to have been	25
2	[coord] it [verb] to have been	15
3	and it [verb] to have been	9
4	and it [verb] to have been	9
5	[subord] it [verb] to have been	9
6	[noun] it [verb] to have been	7
7	but it [verb] to have been	6
8	[adv] it [verb] to have been	6
9	but it [verb] to have been	6
10	it be [verb] to have been	51
11	it [be] [verb] to have been	51
12	it [is] [verb] to have been	35
13	it is [verb] to have been	35
14	it was [verb] to have been	16
15	it [was/were] [verb] to have been	16
16	it [modal v] [verb] to have been	12
17	it [vb mod] [verb] to have been	12
18	it [adv] [verb] to have been	8
19	it would [verb] to have been	8
20	it would [verb] to have been	8
21	it [adv] [verb] to have been	8
22	it [verb] [adv] to have been	19
23	it [verb] [adv] to have been	12
24	it [verb] to have been [verb]	42
25	it [verb] to have been [vb pp]	38
26	it [verb] to have been [art]	30
27	it [verb] to have been [art]	30
28	it [verb] to have been a	20
29	it [verb] to have been [adv]	16
30	it [verb] to have been [adv]	16