SN4 ""

No	Pattern	Freq
1	[det] [vb mod] have been [adj]	220
2	[det] [vb mod] have been [adj]	173
3	[det] would have been [adj]	112
4	that [vb mod] have been [adj]	110
5	this [vb mod] have been [adj]	86
6	[det] may have been [adj]	38
7	[det] must have been [adj]	22
8	[det] could have been [adj]	21
9	[det] [vb mod] have been [num]	20
10	[det] [vb mod] have been [det]	20
11	[det] might have been [adj]	17
12	[det] [vb mod] have been due	14
13	[det] [vb mod] have been due	14
14	[det] [vb mod] have been [adj -er]	14
15	[det] [vb mod] have been one	12
16	these [vb mod] have been [adj]	12
17	[det] [vb mod] have been one	12
18	[det] should have been [adj]	11
19	[det] [vb mod] have been true	10
20	[det] [vb mod] have been true	10
21	[det] [vb mod] have been enough	9
22	[det] [vb mod] have been enough	9
23	[det] [vb mod] have been good	8
24	[det] [vb mod] 've been [adj]	7
25	[det] [vb mod] have been difficult	6
26	all [vb mod] have been [adj]	6
27	[det] [vb mod] have been awful	6
28	[det] [vb mod] have been awful	6
29	[det] [vb mod] have been difficult	6
30	[det] [vb mod] have been easy	5