SN4 ""

No	Pattern	Freq
1	may have been [verb] [prep]	591
2	may have been [vb pp] [prep]	550
3	may have been [verb] by	211
4	may have been [verb] by	211
5	may have been [verb] in	90
6	may have been [verb] in	90
7	may have been [verb] to	59
8	may have been [verb] to	59
9	may have been [verb] with	44
10	may have been [verb] with	44
11	may have been [v-ing] [prep]	40
12	may have been [verb] for	30
13	may have been [verb] for	30
14	may have been [verb] from	28
15	may have been [verb] from	28
16	may have been [verb] on	27
17	may have been [verb] on	27
18	may have been [verb] as	23
19	may have been [verb] as	23
20	may have been used [prep]	22
21	may have been use [prep]	22
22	may have been cause [prep]	19
23	may have been influence [prep]	19
24	may have been caused [prep]	19
25	may have been influenced [prep]	19
26	may have been make [prep]	18
27	may have been made [prep]	18
28	may have been [verb] at	17
29	may have been [verb] at	17
30	may have been write [prep]	11