SN4 ""

No	Pattern	Freq
1	[pron] might have been a [noun]	76
2	[pers pn] might have been a [noun]	50
3	it might have been a [noun]	26
4	it might have been a [noun]	26
5	[noun] might have been a [noun]	25
6	[noun sg] might have been a [noun]	20
7	there might have been a [noun]	14
8	[ex0] might have been a [noun]	14
9	there might have been a [noun]	14
10	he might have been a [noun]	13
11	he might have been a [noun]	13
12	[Wh det] might have been a [noun]	9
13	what might have been a [noun]	7
14	what might have been a [noun]	7
15	[conj] might have been a [noun]	6
16	that might have been a [noun]	6
17	she might have been a [noun]	6
18	that might have been a [noun]	6
19	she might have been a [noun]	6
20	[that] might have been a [noun]	6
21	might [adv] have been a [noun]	19
22	might [adv] have been a [noun]	14
23	might [not/n't] have been a [noun]	5
24	might not have been a [noun]	5
25	might not have been a [noun]	5
26	might have been [prep] a [noun]	8
27	might have been [prep] a [noun]	8
28	might have been [verb] a [noun]	7
29	might have been in a [noun]	6
30	might have been in a [noun]	6