SN4 ""

No	Pattern	Freq
1	[modal v] have been [vb pp] at	117
2	[vb mod] have been [vb pp] at	117
3	[adv] have been [vb pp] at	35
4	would have been [vb pp] at	28
5	could have been [vb pp] at	27
6	could have been [vb pp] at	27
7	would have been [vb pp] at	26
8	should have been [vb pp] at	24
9	should have been [vb pp] at	24
10	[adv] have been [vb pp] at	24
11	may have been [vb pp] at	15
12	may have been [vb pp] at	15
13	[not/n't] have been [vb pp] at	11
14	not have been [vb pp] at	11
15	not have been [vb pp] at	10
16	must have been [vb pp] at	9
17	must have been [vb pp] at	9
18	might have been [vb pp] at	8
19	might have been [vb pp] at	8
20	will have been [vb pp] at	6
21	will have been [vb pp] at	6
22	never have been [vb pp] at	5
23	never have been [vb pp] at	5
24	have been [adv] [vb pp] at	6
25	have been [adv] [vb pp] at	6
26	have been [vb pp] [adv] at	18
27	have been [vb pp] [adv prt] at	10
28	have been [vb pp] [adv] at	8
29	have been [vb pp] [prep] at	8
30	have been [vb pp] [prep] at	8