SN4 ""

No	Pattern	Freq
1	[vb mod] have been	21133
2	[modal v] have been	21133
3	would have been	7305
4	would have been	6970
5	[adv] have been	5020
6	must have been	3371
7	must have been	3371
8	may have been	2861
9	[adv] have been	2861
10	may have been	2861
11	might have been	2512
12	might have been	2512
13	could have been	2479
14	could have been	2479
15	[not/n't] have been	2159
16	not have been	2156
17	should have been	1852
18	should have been	1852
19	not have been	1536
20	will have been	666
21	will have been	637
22	n't have been	620
23	well have been	494
24	well have been	491
25	'd have been	335
26	[pron] have been	273
27	[pers pn] have been	254
28	never have been	234
29	never have been	234
30	also have been	211