SN4 ""

No	Pattern	Freq
1	may have been [adj] [prep]	195
2	may have been [adj] [prep]	195
3	may have been [adj] [prep]	178
4	may have been [adj] in	55
5	may have been [adj] to	44
6	may have been [adj] for	29
7	may have been due [prep]	26
8	may have been due [prep]	26
9	may have been [adj] of	25
10	may have been responsible [prep]	20
11	may have been responsible [prep]	20
12	may have been involved [prep]	13
13	may have been involved [prep]	13
14	may have been [num] [prep]	11
15	may have been [adj] with	10
16	may have been one [prep]	9
17	may have been one [prep]	9
18	may have been [adj] by	7
19	may have been different [prep]	6
20	may have been different [prep]	6
21	may have been present [prep]	5
22	may have been present [prep]	5
23	may have been [adj] about	5