SN4 ""

No	Pattern	Freq
1	[pron] may have been a [noun]	55
2	[noun] may have been a [noun]	33
3	[pers pn] may have been a [noun]	26
4	there may have been a [noun]	21
5	there may have been a [noun]	21
6	[ex0] may have been a [noun]	21
7	[noun sg] may have been a [noun]	20
8	it may have been a [noun]	19
9	it may have been a [noun]	19
10	[adj] may have been a [noun]	9
11	[det] may have been a [noun]	8
12	[noun prp] may have been a [noun]	7
13	he may have been a [noun]	7
14	he may have been a [noun]	7
15	this may have been a [noun]	7
16	this may have been a [noun]	7
17	[noun pl] may have been a [noun]	6
18	[conj] may have been a [noun]	5
19	may [adv] have been a [noun]	37
20	may [adv] have been a [noun]	28
21	may well have been a [noun]	12
22	may well have been a [noun]	12
23	may also have been a [noun]	11
24	may also have been a [noun]	11
25	may not have been a [noun]	9
26	may not have been a [noun]	9
27	may [not/n't] have been a [noun]	9
28	may have been [prep] a [noun]	6
29	may have been [prep] a [noun]	6
30	may have been [verb] a [noun]	5