SN4 ""

No	Pattern	Freq
1	[verb] to have been [prep]	187
2	[vb pp] to have been [prep]	74
3	seem to have been [prep]	59
4	[vb -s] to have been [prep]	53
5	appear to have been [prep]	37
6	[adj] to have been [prep]	37
7	[adj] to have been [prep]	36
8	[vb base] to have been [prep]	31
9	seems to have been [prep]	30
10	appears to have been [prep]	22
11	[adv] to have been [prep]	20
12	say to have been [prep]	18
13	[vb infin] to have been [prep]	17
14	[noun] to have been [prep]	16
15	said to have been [prep]	16
16	believe to have been [prep]	15
17	[adv] to have been [prep]	15
18	likely to have been [prep]	14
19	likely to have been [prep]	14
20	seem to have been [prep]	14
21	believed to have been [prep]	13
22	[vb past] to have been [prep]	12
23	[noun sg] to have been [prep]	11
24	seem to have been [prep]	10
25	appear to have been [prep]	10
26	supposed to have been [prep]	9
27	supposed to have been [prep]	9
28	know to have been [prep]	8
29	be to have been [prep]	7
30	[be] to have been [prep]	7