SN4 ""

No	Pattern	Freq
1	which have been [adj] [prep]	211
2	which have been [adj] [prep]	193
3	which had been [adj] [prep]	105
4	which has been [adj] [prep]	72
5	which have been [adj] in	66
6	which have been [adj] in	66
7	which have been [adj] for	46
8	which have been [adj] for	46
9	which have been [adj] [prep]	34
10	which have been [adj] to	26
11	which have been [adj] to	26
12	which have been [adj] of	22
13	which have been [adj] of	22
14	which have been [adj] since	17
15	which have been [adj] since	17
16	which have been [num] [prep]	14
17	which have been involved [prep]	12
18	which have been involved [prep]	12
19	which have been one [prep]	11
20	which have been one [prep]	11
21	which have been responsible [prep]	10
22	which have been responsible [prep]	10
23	which have been [adj] on	9
24	which have been [adj] on	9
25	which have been available [prep]	8
26	which have been [adj] with	8
27	which have been [adj] with	8
28	which have been available [prep]	8
29	which have been subject [prep]	7
30	which have been subject [prep]	7