SN4 ""

No	Pattern	Freq
1	who had been [noun]	139
2	who have been [noun sg]	112
3	who have been [noun pl]	47
4	who have been [noun prp]	31
5	who have been [noun]	23
6	who has been [noun]	19
7	who have been president	12
8	who have been president	11
9	who have been victims	11
10	who have been victim	11
11	who have been part	8
12	who have been part	8
13	who 've been [noun]	7
14	who have been members	7
15	who have been secretary	7
16	who have been member	7
17	who have been secretary	7
18	who have been chairman	5
19	who have been chairman	5