SN4 ""

No	Pattern	Freq
1	[vb mod] [adv] have been [adj]	496
2	[modal v] [adv] have been [adj]	494
3	[modal v] [adv] have been [adj]	398
4	would [adv] have been [adj]	173
5	would [adv] have been [adj]	164
6	may [adv] have been [adj]	114
7	may [adv] have been [adj]	114
8	[modal v] well have been [adj]	91
9	might [adv] have been [adj]	71
10	might [adv] have been [adj]	71
11	could [adv] have been [adj]	62
12	could [adv] have been [adj]	62
13	[modal v] also have been [adj]	51
14	[modal v] [adv] have been able	43
15	[modal v] [adv] have been able	43
16	[modal v] hardly have been [adj]	41
17	[modal v] [adv] have been [adj -er]	37
18	must [adv] have been [adj]	36
19	must [adv] have been [adj]	36
20	[modal v] never have been [adj]	35
21	[modal v] [adv] have been [det]	33
22	[modal v] probably have been [adj]	32
23	[modal v] [adv] have been [num]	28
24	[modal v] otherwise have been [adj]	26
25	[modal v] still have been [adj]	25
26	can [adv] have been [adj]	19
27	can [adv] have been [adj]	19
28	[modal v] only have been [adj]	16
29	[modal v] [adv] have been possible	16
30	[modal v] surely have been [adj]	16