SN4 ""

No	Pattern	Freq
1	[vb mod] have [been] in	460
2	[modal v] have [been] in	460
3	would have [been] in	158
4	would have [been] in	145
5	[adv] have [been] in	102
6	must have [been] in	88
7	must have [been] in	88
8	[adv] have [been] in	63
9	may have [been] in	61
10	may have [been] in	61
11	might have [been] in	58
12	might have [been] in	58
13	could have [been] in	41
14	could have [been] in	41
15	[not/n't] have [been] in	39
16	not have [been] in	39
17	should have [been] in	37
18	should have [been] in	37
19	not have [been] in	29
20	will have [been] in	17
21	well have [been] in	16
22	well have [been] in	16
23	will have [been] in	16
24	'd have [been] in	13
25	never have [been] in	12
26	never have [been] in	12
27	n't have [been] in	10
28	still have [been] in	6
29	still have [been] in	6
30	have [adv] [been] in	6