SN4 ""

No	Pattern	Freq
1	[modal v] have been [vb pp] for [noun]	50
2	[vb mod] have been [vb pp] for [noun]	50
3	[modal v] have been [vb pp] for [noun sg]	34
4	could have been [vb pp] for [noun]	12
5	[modal v] have been [vb pp] for [noun pl]	12
6	could have been [vb pp] for [noun]	12
7	would have been [vb pp] for [noun]	11
8	would have been [vb pp] for [noun]	11
9	should have been [vb pp] for [noun]	10
10	should have been [vb pp] for [noun]	10
11	may have been [vb pp] for [noun]	9
12	may have been [vb pp] for [noun]	9
13	[modal v] have been used for [noun]	7
14	[modal v] have been [vb pp] for life	7
15	[modal v] have been [vb pp] for life	7
16	might have been [vb pp] for [noun]	5
17	might have been [vb pp] for [noun]	5