SN4 ""

No	Pattern	Freq
1	have been [vb pp] on the	887
2	has been [vb pp] on the	311
3	had been [vb pp] on the	260
4	have been [vb pp] on the	181
5	have been [vb pp] on the	66
6	have been placed on the	54
7	have been based on the	51
8	to have been [vb pp] on the	31
9	have been done on the	30
10	have been put on the	29
11	have been made on the	28
12	have been focused on the	24
13	have been written on the	22
14	have been spent on the	21
15	have been built on the	20
16	have been found on the	20
17	having been [vb pp] on the	15
18	have been used on the	14
19	have been left on the	14
20	's been [vb pp] on the	13
21	have been reached on the	11
22	have been imposed on the	11
23	have been published on the	11
24	have been cast on the	8
25	have been criticised on the	8
26	have been concentrated on the	8
27	have been entered on the	8
28	have been established on the	7
29	have been served on the	7
30	'd been [vb pp] on the	7