SN4 ""

No	Pattern	Freq
1	[noun] which have been [prep]	118
2	[noun sg] which have been [prep]	81
3	[noun pl] which have been [prep]	30
4	[prep] which have been [prep]	14
5	[prep] which have been [prep]	14
6	of which have been [prep]	13
7	of which have been [prep]	13
8	[noun prp] which have been [prep]	5
9	which [modal v] have been [prep]	27
10	which [vb mod] have been [prep]	27
11	which would have been [prep]	9
12	which would have been [prep]	9
13	which [pron] have been [prep]	9
14	which [pers pn] have been [prep]	9
15	which [noun] have been [prep]	8
16	which may have been [prep]	7
17	which may have been [prep]	7
18	which must have been [prep]	5
19	which must have been [prep]	5
20	which have [adv] been [prep]	32
21	which have [adv] been [prep]	23
22	which have not been [prep]	9
23	which have not been [prep]	9
24	which have [not/n't] been [prep]	9
25	which have been [verb] [prep]	2749
26	which have been [vb pp] [prep]	2621
27	which have been [adj] [prep]	211
28	which have been [adj] [prep]	193
29	which have been [v-ing] [prep]	128
30	which have been use [prep]	61