SN4 ""

No	Pattern	Freq
1	have been [vb pp] on the	887
2	[vb -s] been [vb pp] on the	324
3	has been [vb pp] on the	311
4	[vb past] been [vb pp] on the	267
5	had been [vb pp] on the	260
6	[vb base] been [vb pp] on the	184
7	have been [vb pp] on the	181
8	[vb infin] been [vb pp] on the	66
9	have been [vb pp] on the	66
10	[verb] been placed on the	54
11	[verb] been based on the	51
12	[to-vb] been [vb pp] on the	31
13	to have been [vb pp] on the	31
14	[verb] been done on the	30
15	[verb] been put on the	29
16	[verb] been made on the	28
17	[verb] been focused on the	24
18	[verb] been written on the	22
19	[verb] been spent on the	21
20	[verb] been built on the	20
21	[verb] been found on the	20
22	[v-ing] been [vb pp] on the	15
23	having been [vb pp] on the	15
24	[verb] been used on the	14
25	[verb] been left on the	14
26	's been [vb pp] on the	13
27	[verb] been published on the	11
28	[verb] been imposed on the	11
29	[verb] been reached on the	11
30	[verb] been criticised on the	8