SN4 ""

No	Pattern	Freq
1	[modal v] have been [adv] [det]	71
2	[vb mod] have been [adv] [det]	71
3	[modal v] have been [adv] much	29
4	would have been [adv] [det]	29
5	would have been [adv] [det]	27
6	[modal v] have been too [det]	17
7	must have been [adv] [det]	12
8	must have been [adv] [det]	12
9	[modal v] have been [adv] all	11
10	may have been [adv] [det]	11
11	may have been [adv] [det]	11
12	could have been [adv] [det]	10
13	[modal v] have been as [det]	10
14	could have been [adv] [det]	10
15	[modal v] have been just [det]	9
16	[modal v] have been there [det]	9
17	[modal v] have been so [det]	7
18	[modal v] have been [adv] another	7
19	might have been [adv] [det]	5
20	[modal v] have been [adv] many	5
21	might have been [adv] [det]	5