SN4 ""

No	Pattern	Freq
1	[modal v] have been [adj]	3564
2	[vb mod] have been [adj]	3564
3	would have been [adj]	1837
4	would have been [adj]	1765
5	[adv] have been [adj]	989
6	must have been [adj]	546
7	must have been [adj]	546
8	not have been [adj]	534
9	[not/n't] have been [adj]	534
10	[adv] have been [adj]	455
11	may have been [adj]	452
12	may have been [adj]	452
13	not have been [adj]	416
14	might have been [adj]	319
15	might have been [adj]	319
16	could have been [adj]	172
17	could have been [adj]	172
18	should have been [adj]	168
19	should have been [adj]	168
20	n't have been [adj]	118
21	well have been [adj]	79
22	well have been [adj]	79
23	'd have been [adj]	72
24	will have been [adj]	59
25	will have been [adj]	56
26	also have been [adj]	44
27	also have been [adj]	44
28	[pron] have been [adj]	43
29	[pers pn] have been [adj]	41
30	otherwise have been [adj]	32