SN4 ""

No	Pattern	Freq
1	[vb mod] have been [adv] [adj]	1511
2	[modal v] have been [adv] [adj]	1503
3	[modal v] have been [adv] [adj]	1486
4	[modal v] have been [adv] [adj]	1219
5	would have been [adv] [adj]	717
6	would have been [adv] [adj]	691
7	must have been [adv] [adj]	322
8	must have been [adv] [adj]	322
9	[modal v] have been more [adj]	211
10	[modal v] have been more [adj]	211
11	[modal v] have been very [adj]	194
12	[modal v] have been very [adj]	194
13	may have been [adv] [adj]	147
14	may have been [adv] [adj]	147
15	might have been [adv] [adj]	123
16	might have been [adv] [adj]	123
17	[modal v] have been [adv] [adj -er]	120
18	[modal v] have been too [adj]	103
19	[modal v] have been too [adj]	103
20	could have been [adv] [adj]	102
21	could have been [adv] [adj]	102
22	[modal v] have been [adv] [num]	92
23	[modal v] have been quite [adj]	81
24	[modal v] have been quite [adj]	81
25	should have been [adv] [adj]	78
26	should have been [adv] [adj]	78
27	[modal v] have been [adv] [det]	75
28	[modal v] have been so [adj]	68
29	[modal v] have been so [adj]	68
30	[modal v] have been about [adj]	59