SN4 ""

No	Pattern	Freq
1	[verb] it to have been	20
2	it [verb] to have been	118
3	it [vb -s] to have been	101
4	it seem to have been	79
5	it seems to have been	74
6	it appear to have been	25
7	it appears to have been	19
8	it [vb past] to have been	16
9	it ought to have been	8
10	it [modal v] to have been	8
11	it [vb mod] to have been	8
12	it ought to have been	8
13	it was to have been	7
14	it [was/were] to have been	7
15	it be to have been	7
16	it [be] to have been	7
17	it appeared to have been	6
18	it have to have been	5
19	it seemed to have been	5
20	it to have been [verb]	7
21	it to have been [vb pp]	7
22	it to have been [art]	6
23	it to have been [art]	6
24	it to have been [adj]	5