SN4 ""

No	Pattern	Freq
1	[noun] [conj] to have been	18
2	[noun sg] [conj] to have been	12
3	[adj] [conj] to have been	6
4	[conj] [verb] to have been	96
5	[conj] seem to have been	44
6	[conj] [vb -s] to have been	44
7	[conj] appear to have been	31
8	[conj] [vb past] to have been	27
9	[conj] seems to have been	24
10	[conj] [vb base] to have been	20
11	[conj] appears to have been	18
12	[conj] seem to have been	11
13	[conj] [adv] to have been	9
14	[conj] seemed to have been	9
15	[conj] ought to have been	8
16	[conj] ought to have been	8
17	[conj] [vb mod] to have been	8
18	[conj] [modal v] to have been	8
19	[conj] appeared to have been	8
20	[conj] [adv] to have been	7
21	[conj] [noun] to have been	6
22	[conj] appear to have been	5
23	[conj] be to have been	5
24	[conj] [be] to have been	5
25	[conj] [was/were] to have been	5
26	[conj] said to have been	5
27	[conj] [vb pp] to have been	5
28	[conj] say to have been	5
29	[conj] to have been [verb]	16
30	[conj] to have been [vb pp]	15