SN4 ""

No	Pattern	Freq
1	have been [det] [noun pl]	212
2	have been many [noun pl]	108
3	have been some [noun pl]	74
4	had been [det] [noun pl]	72
5	have been several [noun pl]	67
6	have been few [noun pl]	33
7	have been [det] [noun pl]	31
8	have been any [noun pl]	22
9	have been [det] attempts	22
10	have been [det] changes	19
11	have been [det] studies	15
12	have been [det] years	11
13	have been [det] cases	11
14	's been [det] [noun pl]	10
15	have been more [noun pl]	10
16	have been all [noun pl]	9
17	have been [det] examples	8
18	have been [det] times	8
19	have been those [noun pl]	7
20	've been [det] [noun pl]	7
21	have been [det] reports	6
22	have been [det] problems	6
23	have been [det] occasions	6
24	have been [det] suggestions	6
25	have been [det] improvements	5
26	has been [det] [noun pl]	5
27	have been fewer [noun pl]	5