SN4 ""

No	Pattern	Freq
1	have been [adv] [verb] for	12
2	have been [adv] [verb] for	12
3	have been [adj] [verb] for	11
4	have been [verb] [verb] for	9
5	have been [vb pp] [verb] for	8
6	have been [adj] [verb] for	8
7	[vb mod] have been [verb] for	286
8	[modal v] have been [verb] for	286
9	would have been [verb] for	73
10	would have been [verb] for	70
11	could have been [verb] for	67
12	could have been [verb] for	67
13	[adv] have been [verb] for	61
14	[adv] have been [verb] for	46
15	might have been [verb] for	37
16	might have been [verb] for	37
17	must have been [verb] for	36
18	must have been [verb] for	36
19	may have been [verb] for	30
20	may have been [verb] for	30
21	should have been [verb] for	26
22	should have been [verb] for	26
23	will have been [verb] for	17
24	will have been [verb] for	16
25	[not/n't] have been [verb] for	15
26	not have been [verb] for	15
27	not have been [verb] for	11
28	well have been [verb] for	6
29	well have been [verb] for	6
30	also have been [verb] for	5