SN4 ""

No	Pattern	Freq
1	[vb mod] have been [det] [noun]	173
2	[modal v] have been [det] [noun]	169
3	[modal v] have been [det] [noun sg]	136
4	[modal v] have been some [noun]	73
5	must have been [det] [noun]	50
6	must have been [det] [noun]	50
7	would have been [det] [noun]	39
8	would have been [det] [noun]	34
9	could have been [det] [noun]	30
10	could have been [det] [noun]	30
11	[modal v] have been [det] [noun pl]	28
12	may have been [det] [noun]	21
13	may have been [det] [noun]	21
14	might have been [det] [noun]	20
15	might have been [det] [noun]	20
16	[modal v] have been little [noun]	15
17	[modal v] have been that [noun]	14
18	[modal v] have been any [noun]	12
19	[modal v] have been [det] sort	11
20	[modal v] have been [det] sort	10
21	[modal v] have been another [noun]	10
22	[modal v] have been this [noun]	8
23	should have been [det] [noun]	8
24	[modal v] have been many [noun]	8
25	should have been [det] [noun]	8
26	[modal v] have been [det] [n mass]	8
27	[modal v] have been more [noun]	7
28	[modal v] have been [det] hope	5
29	[modal v] have been [det] hope	5
30	[modal v] have been several [noun]	5