SN4 ""

No	Pattern	Freq
1	[vb pp] to have been [vb pp]	859
2	seem to have been [vb pp]	513
3	[vb -s] to have been [vb pp]	432
4	appear to have been [vb pp]	349
5	[vb past] to have been [vb pp]	318
6	seems to have been [vb pp]	262
7	[vb base] to have been [vb pp]	229
8	say to have been [vb pp]	208
9	said to have been [vb pp]	158
10	report to have been [vb pp]	155
11	reported to have been [vb pp]	150
12	appears to have been [vb pp]	148
13	thought to have been [vb pp]	130
14	think to have been [vb pp]	130
15	seem to have been [vb pp]	127
16	believe to have been [vb pp]	124
17	[vb infin] to have been [vb pp]	99
18	believed to have been [vb pp]	92
19	seemed to have been [vb pp]	90
20	appear to have been [vb pp]	81
21	[verb] to have been made	79
22	appeared to have been [vb pp]	78
23	know to have been [vb pp]	66
24	known to have been [vb pp]	65
25	[verb] to have been killed	62
26	said to have been [vb pp]	50
27	allege to have been [vb pp]	48
28	[verb] to have been used	42
29	deem to have been [vb pp]	40
30	appear to have been [vb pp]	40