SN4 ""

No	Pattern	Freq
1	[verb] to have [been] [art]	593
2	[vb -s] to have [been] [art]	278
3	seem to have [been] [art]	258
4	seems to have [been] [art]	193
5	[vb pp] to have [been] [art]	166
6	appear to have [been] [art]	107
7	[adj] to have [been] [art]	80
8	appears to have [been] [art]	72
9	[adj] to have [been] [art]	71
10	[vb infin] to have [been] [art]	67
11	say to have [been] [art]	46
12	[vb base] to have [been] [art]	46
13	[adv] to have [been] [art]	43
14	said to have [been] [art]	42
15	thought to have [been] [art]	35
16	think to have [been] [art]	35
17	[vb past] to have [been] [art]	34
18	[noun] to have [been] [art]	34
19	seem to have [been] [art]	31
20	[be] to have [been] [art]	31
21	be to have [been] [art]	31
22	[was/were] to have [been] [art]	31
23	was to have [been] [art]	31
24	likely to have [been] [art]	30
25	likely to have [been] [art]	30
26	seem to have [been] [art]	27
27	believe to have [been] [art]	26
28	[adv] to have [been] [art]	22
29	believed to have [been] [art]	21
30	[pron] to have [been] [art]	20