SN4 ""

No	Pattern	Freq
1	[pron] might have [been]	1323
2	[pers pn] might have [been]	979
3	[noun] might have [been]	755
4	it might have [been]	450
5	it might have [been]	450
6	[noun sg] might have [been]	446
7	[noun pl] might have [been]	204
8	[conj] might have [been]	195
9	[Wh det] might have [been]	190
10	he might have [been]	189
11	he might have [been]	189
12	they might have [been]	122
13	they might have [been]	114
14	what might have [been]	109
15	what might have [been]	109
16	[adj] might have [been]	105
17	[ex0] might have [been]	95
18	there might have [been]	95
19	there might have [been]	95
20	[noun prp] might have [been]	95
21	that might have [been]	94
22	that might have [been]	94
23	[that] might have [been]	94
24	she might have [been]	93
25	she might have [been]	93
26	which might have [been]	79
27	which might have [been]	79
28	[det] might have [been]	78
29	[subord] might have [been]	73
30	i might have [been]	62