SN4 ""

No	Pattern	Freq
1	[vb mod] have been [noun]	673
2	[modal v] have been [noun]	660
3	[modal v] have been [noun sg]	295
4	would have been [noun]	197
5	would have been [noun]	187
6	[modal v] have been [noun prp]	182
7	[modal v] have been [noun pl]	159
8	must have been [noun]	120
9	must have been [noun]	120
10	may have been [noun]	110
11	may have been [noun]	110
12	might have been [noun]	101
13	might have been [noun]	101
14	could have been [noun]	94
15	could have been [noun]	94
16	should have been [noun]	39
17	should have been [noun]	39
18	[modal v] have been [n mass]	32
19	[modal v] have been part	26
20	[modal v] have been part	26
21	[modal v] 've been [noun]	11
22	will have been [noun]	10
23	'd have been [noun]	10
24	[modal v] have been time	8
25	will have been [noun]	8
26	[modal v] have been time	7
27	[modal v] have been others	6
28	[modal v] have been other	6
29	[modal v] have been blood	5
30	[modal v] have been money	5