SN4 ""

No	Pattern	Freq
1	[modal v] have been in [adj]	81
2	[vb mod] have been in [adj]	81
3	[modal v] have been in [adj]	80
4	[modal v] have been in [adj]	37
5	[modal v] have been in [det]	31
6	would have been in [adj]	22
7	would have been in [adj]	21
8	must have been in [adj]	16
9	must have been in [adj]	16
10	could have been in [adj]	14
11	could have been in [adj]	14
12	may have been in [adj]	11
13	may have been in [adj]	11
14	might have been in [adj]	10
15	might have been in [adj]	10
16	[modal v] have been in some	9
17	[modal v] have been in some	9
18	[modal v] have been in [num]	9
19	[modal v] have been in this	7
20	[modal v] have been in this	7
21	[modal v] have been in that	6
22	[modal v] have been in that	6
23	will have been in [adj]	5