SN4 ""

No	Pattern	Freq
1	have been [vb pp] in [noun pl]	321
2	have been [vb pp] in [noun pl]	130
3	has been [vb pp] in [noun pl]	98
4	had been [vb pp] in [noun pl]	54
5	have been [vb pp] in terms	51
6	have been [vb pp] in [noun pl]	25
7	have been [vb pp] in patients	21
8	have been found in [noun pl]	18
9	have been reported in [noun pl]	15
10	have been described in [noun pl]	14
11	to have been [vb pp] in [noun pl]	12
12	have been killed in [noun pl]	11
13	have been [vb pp] in studies	10
14	have been used in [noun pl]	9
15	have been made in [noun pl]	9
16	have been shown in [noun pl]	9
17	have been [vb pp] in areas	7
18	have been [vb pp] in places	6
19	have been [vb pp] in animals	6
20	have been done in [noun pl]	6
21	have been recorded in [noun pl]	5
22	have been [vb pp] in cases	5
23	have been noted in [noun pl]	5
24	have been observed in [noun pl]	5
25	have been [vb pp] in clashes	5
26	have been seen in [noun pl]	5
27	have been engaged in [noun pl]	5
28	have been [vb pp] in circumstances	5