SN4 ""

No	Pattern	Freq
1	[vb mod] have been [det]	361
2	[modal v] have been [det]	361
3	[adv] have been [det]	118
4	would have been [det]	97
5	must have been [det]	92
6	must have been [det]	92
7	would have been [det]	91
8	not have been [det]	81
9	[not/n't] have been [det]	81
10	could have been [det]	62
11	could have been [det]	62
12	may have been [det]	49
13	may have been [det]	49
14	n't have been [det]	44
15	[adv] have been [det]	37
16	not have been [det]	37
17	might have been [det]	35
18	might have been [det]	35
19	should have been [det]	13
20	should have been [det]	13
21	can have been [det]	8
22	well have been [det]	8
23	well have been [det]	8
24	can have been [det]	8
25	[pron] have been [det]	7
26	[pers pn] have been [det]	7
27	'd have been [det]	6
28	also have been [det]	5
29	also have been [det]	5
30	have been [prep] [det]	146