SN4 ""

No	Pattern	Freq
1	[noun] may have been [prep]	66
2	[pron] may have been [prep]	61
3	[pers pn] may have been [prep]	43
4	[noun sg] may have been [prep]	33
5	it may have been [prep]	26
6	it may have been [prep]	26
7	[noun pl] may have been [prep]	21
8	[noun prp] may have been [prep]	11
9	[Wh det] may have been [prep]	10
10	they may have been [prep]	8
11	[det] may have been [prep]	8
12	[adj] may have been [prep]	8
13	they may have been [prep]	8
14	which may have been [prep]	7
15	which may have been [prep]	7
16	this may have been [prep]	6
17	he may have been [prep]	6
18	this may have been [prep]	6
19	he may have been [prep]	6
20	may [adv] have been [prep]	48
21	may [adv] have been [prep]	33
22	may well have been [prep]	16
23	may well have been [prep]	16
24	may [not/n't] have been [prep]	15
25	may not have been [prep]	15
26	may not have been [prep]	15
27	may also have been [prep]	9
28	may also have been [prep]	9
29	may have been [verb] [prep]	591
30	may have been [vb pp] [prep]	550