SN4 ""

No	Pattern	Freq
1	[modal v] have been responsible for the	22
2	[vb mod] have been responsible for the	22
3	may have be responsible for the	14
4	may have been responsible for the	14
5	may [vb infin] been responsible for the	14
6	may have [be] responsible for the	14
7	may have been responsible for [art]	14
8	may have been responsible for the	14
9	may have been responsible for the	14
10	may [verb] been responsible for the	14
11	may have been responsible for [art]	14
12	may have been [adj] for the	14
13	may have been responsible [prep] the	14
14	may have [been] responsible for the	14
15	may have been responsible for the	14
16	may have been responsible [prep] the	14