SN4 ""

No	Pattern	Freq
1	[modal v] have been [prep] [noun]	279
2	[vb mod] have been [prep] [noun]	279
3	would have been [prep] [noun]	98
4	would have been [prep] [noun]	87
5	[adv] have been [prep] [noun]	58
6	[adv] have been [prep] [noun]	44
7	must have been [prep] [noun]	39
8	must have been [prep] [noun]	39
9	might have been [prep] [noun]	38
10	might have been [prep] [noun]	38
11	may have been [prep] [noun]	36
12	may have been [prep] [noun]	36
13	should have been [prep] [noun]	34
14	should have been [prep] [noun]	34
15	could have been [prep] [noun]	23
16	could have been [prep] [noun]	23
17	not have been [prep] [noun]	14
18	[not/n't] have been [prep] [noun]	14
19	will have been [prep] [noun]	11
20	will have been [prep] [noun]	11
21	'd have been [prep] [noun]	11
22	not have been [prep] [noun]	10
23	well have been [prep] [noun]	8
24	well have been [prep] [noun]	8
25	also have been [prep] [noun]	6
26	also have been [prep] [noun]	6
27	have been [verb] [prep] [noun]	863
28	have been [vb pp] [prep] [noun]	788
29	have been [adj] [prep] [noun]	277
30	have been [adj] [prep] [noun]	243