SN4 ""

No	Pattern	Freq
1	may have been [verb]	1109
2	may have been [vb pp]	987
3	may have been [v-ing]	117
4	may have been use	38
5	may have been make	35
6	may have been made	35
7	may have been used	35
8	may have been cause	24
9	may have been caused	22
10	may have been influence	20
11	may have been influenced	20
12	may have been take	15
13	may have been intend	14
14	may have been taken	13
15	may have been write	12
16	may have been intended	12
17	may have been written	11
18	may have been given	11
19	may have been bear	11
20	may have been give	11
21	may have been lost	10
22	may have been relate	10
23	may have been lose	10
24	may have been related	10
25	may have been produce	9
26	may have been base	9
27	may have been do	9
28	may have been produced	9
29	may have been based	9
30	may have been born	9