SN4 ""

No	Pattern	Freq
1	[vb mod] have [adv] been	130
2	[modal v] have [adv] been	130
3	would have [adv] been	48
4	would have [adv] been	43
5	may have [adv] been	26
6	may have [adv] been	26
7	must have [adv] been	20
8	must have [adv] been	20
9	could have [adv] been	15
10	[adv] have [adv] been	15
11	could have [adv] been	15
12	not have [adv] been	10
13	might have [adv] been	10
14	[not/n't] have [adv] been	10
15	might have [adv] been	10
16	will have [adv] been	7
17	will have [adv] been	7
18	not have [adv] been	6
19	'd have [adv] been	5
20	[adv] have [adv] been	5
21	have [adv] [adv] been	6
22	have [adv] [adv] been	5
23	have [adv] have been	6
24	have [adv] [verb] been	6
25	have [adv] [vb base] been	6
26	have [adv] have been	6
27	have [adv] [adv] been	5
28	have [adv] [adv] been	5
29	have [adv] been [verb]	75
30	have [adv] been [vb pp]	68