SN4 ""

No	Pattern	Freq
1	[noun] which have been	3601
2	[noun sg] which have been	2072
3	[noun pl] which have been	1370
4	[prep] which have been	334
5	[prep] which have been	334
6	of which have been	302
7	of which have been	302
8	[adj] which have been	143
9	[conj] which have been	113
10	[coord] which have been	113
11	[noun prp] which have been	111
12	[det] which have been	92
13	and which have been	80
14	and which have been	80
15	[pron] which have been	74
16	[indef pn] which have been	66
17	[verb] which have been	47
18	[n mass] which have been	47
19	that which have been	42
20	that which have been	42
21	those which have been	41
22	those which have been	41
23	[num] which have been	38
24	one which have been	35
25	one which have been	35
26	work which have been	27
27	work which have been	27
28	area which have been	27
29	but which have been	25
30	but which have been	25