SN4 ""

No	Pattern	Freq
1	[det] [vb mod] have been [adj]	220
2	[det] [modal v] have been [adj]	166
3	[det] would have been [adj]	107
4	[det] would have been [adj]	107
5	that [modal v] have been [adj]	104
6	this [modal v] have been [adj]	85
7	[det] may have been [adj]	38
8	[det] may have been [adj]	38
9	[det] must have been [adj]	22
10	[det] must have been [adj]	22
11	[det] [modal v] have been [num]	20
12	[det] could have been [adj]	20
13	[det] could have been [adj]	20
14	[det] [modal v] have been [det]	20
15	[det] might have been [adj]	17
16	[det] might have been [adj]	17
17	[det] [modal v] have been [adj -er]	14
18	[det] [modal v] have been due	14
19	[det] [modal v] have been due	14
20	[det] [modal v] have been one	12
21	[det] [modal v] have been one	12
22	these [modal v] have been [adj]	12
23	[det] should have been [adj]	10
24	[det] [modal v] have been true	10
25	[det] [modal v] have been true	10
26	[det] should have been [adj]	10
27	[det] [modal v] have been enough	9
28	[det] [modal v] have been enough	9
29	[det] [modal v] have been good	7
30	[det] [modal v] have been difficult	6