SN4 ""

No	Pattern	Freq
1	[pron] may have been [noun]	61
2	[noun] may have been [noun]	30
3	[ex0] may have been [noun]	27
4	[pers pn] may have been [noun]	27
5	there may have been [noun]	27
6	there may have been [noun]	27
7	[noun sg] may have been [noun]	22
8	it may have been [noun]	20
9	it may have been [noun]	20
10	[adj] may have been [noun]	11
11	[det] may have been [noun]	10
12	[noun pl] may have been [noun]	6
13	[Wh det] may have been [noun]	6
14	which may have been [noun]	6
15	which may have been [noun]	6
16	this may have been [noun]	5
17	this may have been [noun]	5
18	may [adv] have been [noun]	29
19	may [adv] have been [noun]	20
20	may well have been [noun]	10
21	may well have been [noun]	10
22	may [not/n't] have been [noun]	9
23	may not have been [noun]	9
24	may not have been [noun]	9
25	may have been [art] [noun]	239
26	may have been [art] [noun]	239
27	may have been a [noun]	128
28	may have been a [noun]	113
29	may have been the [noun]	107
30	may have been the [noun]	107