SN4 ""

No	Pattern	Freq
1	[conj] [pers pn] may have been [adj]	23
2	[verb] [pers pn] may have been [adj]	13
3	[noun] [pers pn] may have been [adj]	9
4	[coord] [pers pn] may have been [adj]	9
5	[subord] [pers pn] may have been [adj]	7
6	that [pers pn] may have been [adj]	7
7	[that] [pers pn] may have been [adj]	7
8	that [pers pn] may have been [adj]	7
9	and [pers pn] may have been [adj]	6
10	[noun sg] [pers pn] may have been [adj]	6
11	and [pers pn] may have been [adj]	6
12	[pers pn] may [adv] have been [adj]	43
13	[pers pn] may [adv] have been [adj]	27
14	[pers pn] may not have been [adj]	16
15	[pers pn] may [not/n't] have been [adj]	16
16	[pers pn] may not have been [adj]	16
17	[pers pn] may well have been [adj]	11
18	[pers pn] may well have been [adj]	11
19	[pers pn] may also have been [adj]	8
20	[pers pn] may also have been [adj]	8
21	[pers pn] may have been [art] [adj]	36
22	[pers pn] may have been [art] [adj]	36
23	[pers pn] may have been [adv] [adj]	30
24	[pers pn] may have been [adv] [adj]	29
25	[pers pn] may have been a [adj]	20
26	[pers pn] may have been a [adj]	15
27	[pers pn] may have been the [adj]	14
28	[pers pn] may have been the [adj]	14
29	[pers pn] may have been [prep] [adj]	8
30	[pers pn] may have been [prep] [adj]	8