SN4 ""

No	Pattern	Freq
1	[noun] may have been [adj] [prep]	99
2	[pron] may have been [adj] [prep]	46
3	[noun pl] may have been [adj] [prep]	41
4	[noun sg] may have been [adj] [prep]	36
5	[pers pn] may have been [adj] [prep]	32
6	[noun prp] may have been [adj] [prep]	22
7	[adj] may have been [adj] [prep]	22
8	[det] may have been [adj] [prep]	19
9	this may have been [adj] [prep]	16
10	this may have been [adj] [prep]	16
11	[conj] may have been [adj] [prep]	14
12	[coord] may have been [adj] [prep]	11
13	it may have been [adj] [prep]	10
14	it may have been [adj] [prep]	10
15	they may have been [adj] [prep]	9
16	which may have been [adj] [prep]	9
17	which may have been [adj] [prep]	9
18	[Wh det] may have been [adj] [prep]	9
19	and may have been [adj] [prep]	8
20	and may have been [adj] [prep]	8
21	he may have been [adj] [prep]	7
22	they may have been [adj] [prep]	7
23	he may have been [adj] [prep]	7
24	may [adv] have been [adj] [prep]	60
25	may [adv] have been [adj] [prep]	41
26	may well have been [adj] [prep]	23
27	may well have been [adj] [prep]	23
28	may [not/n't] have been [adj] [prep]	19
29	may not have been [adj] [prep]	19
30	may not have been [adj] [prep]	19