SN4 ""

No	Pattern	Freq
1	have been [vb pp] in [adj]	275
2	has been [vb pp] in [adj]	272
3	had been [vb pp] in [adj]	160
4	have been [vb pp] in recent	109
5	have been [vb pp] in other	56
6	have been [vb pp] in [adj]	40
7	have been used in [adj]	35
8	have been made in [adj]	35
9	have been found in [adj]	31
10	have been [vb pp] in various	27
11	to have been [vb pp] in [adj]	23
12	have been [vb pp] in previous	20
13	have been [vb pp] in full	18
14	have been described in [adj]	16
15	have been [vb pp] in different	14
16	have been observed in [adj]	14
17	have been [vb pp] in late	14
18	have been killed in [adj]	14
19	have been reported in [adj]	13
20	have been held in [adj]	13
21	have been [vb pp] in great	12
22	have been shown in [adj]	12
23	have been developed in [adj]	11
24	have been [vb pp] in early	11
25	have been published in [adj]	9
26	have been seen in [adj]	9
27	have been kept in [adj]	8
28	have been [vb pp] in numerous	8
29	have been [vb pp] in good	8
30	have been [vb pp] in certain	8