SN4 ""

No	Pattern	Freq
1	[vb mod] have been [art] [adj]	1232
2	[modal v] have been [art] [adj]	1220
3	[modal v] have been [art] [adj]	960
4	[modal v] have been a [adj]	746
5	would have been [art] [adj]	432
6	would have been [art] [adj]	422
7	[modal v] have been the [adj]	317
8	must have been [art] [adj]	291
9	must have been [art] [adj]	291
10	may have been [art] [adj]	172
11	may have been [art] [adj]	172
12	[modal v] have been an [adj]	127
13	could have been [art] [adj]	121
14	could have been [art] [adj]	121
15	might have been [art] [adj]	108
16	might have been [art] [adj]	108
17	should have been [art] [adj]	87
18	should have been [art] [adj]	87
19	[modal v] have been [art] [num ord]	86
20	[modal v] have been [art] good	73
21	[modal v] have been [art] [adj -er]	55
22	[modal v] have been [art] [det]	54
23	[modal v] have been [art] [adj -est]	47
24	[modal v] have been [art] first	45
25	[modal v] have been [art] first	45
26	[modal v] have been no [adj]	42
27	[modal v] have been [art] great	41
28	[modal v] have been [art] good	34
29	[modal v] have been [art] [num]	30
30	[modal v] have been [art] same	30