SN4 ""

No	Pattern	Freq
1	[conj] [pers pn] have been an [adj]	36
2	[subord] [pers pn] have been an [adj]	16
3	[coord] [pers pn] have been an [adj]	12
4	but [pers pn] have been an [adj]	10
5	but [pers pn] have been an [adj]	10
6	if [pers pn] have been an [adj]	9
7	if [pers pn] have been an [adj]	9
8	that [pers pn] have been an [adj]	8
9	[that] [pers pn] have been an [adj]	8
10	that [pers pn] have been an [adj]	8
11	[noun] [pers pn] have been an [adj]	8
12	[noun sg] [pers pn] have been an [adj]	6
13	[pers pn] [modal v] have been an [adj]	40
14	[pers pn] [vb mod] have been an [adj]	40
15	[pers pn] would have been an [adj]	15
16	[pers pn] would have been an [adj]	14
17	[pers pn] must have been an [adj]	12
18	[pers pn] must have been an [adj]	12
19	[pers pn] could have been an [adj]	7
20	[pers pn] could have been an [adj]	7
21	[pers pn] seem have been an [adj]	5
22	[pers pn] may have been an [adj]	5
23	[pers pn] [verb] have been an [adj]	5
24	[pers pn] may have been an [adj]	5
25	[pers pn] have [adv] been an [adj]	40
26	[pers pn] have [adv] been an [adj]	25
27	[pers pn] have [not/n't] been an [adj]	15
28	[pers pn] have not been an [adj]	15
29	[pers pn] have always been an [adj]	13
30	[pers pn] have always been an [adj]	13