SN4 ""

No	Pattern	Freq
1	[verb] to have been [verb] for	67
2	[vb pp] to have been [verb] for	26
3	seem to have been [verb] for	21
4	appear to have been [verb] for	13
5	[vb base] to have been [verb] for	12
6	[vb -s] to have been [verb] for	12
7	seem to have been [verb] for	10
8	[vb past] to have been [verb] for	10
9	[adj] to have been [verb] for	8
10	[adv] to have been [verb] for	8
11	[vb infin] to have been [verb] for	7
12	say to have been [verb] for	6
13	[adj] to have been [verb] for	6
14	seems to have been [verb] for	6
15	[noun] to have been [verb] for	6
16	[noun sg] to have been [verb] for	6
17	thought to have been [verb] for	5
18	said to have been [verb] for	5
19	think to have been [verb] for	5
20	appears to have been [verb] for	5
21	to have been [verb] [adv] for	11
22	to have been [verb] [adv prt] for	6
23	to have been [verb] [adv] for	5
24	to have been [verb] for [art]	29
25	to have been [verb] for [art]	29
26	to have been [verb] for [noun]	22
27	to have been [verb] for the	21
28	to have been [verb] for the	21
29	to have been [verb] for [adj]	19
30	to have been [verb] for [noun sg]	12