SN4 ""

No	Pattern	Freq
1	which have been [vb pp] [prep] [det]	135
2	which have been [vb pp] [prep] [det]	135
3	which has been [vb pp] [prep] [det]	62
4	which have been [vb pp] [prep] [det]	38
5	which had been [vb pp] [prep] [det]	35
6	which have been [vb pp] in [det]	34
7	which have been [vb pp] in [det]	34
8	which have been [vb pp] [prep] this	28
9	which have been [vb pp] by [det]	27
10	which have been [vb pp] by [det]	27
11	which have been [vb pp] [prep] many	22
12	which have been [vb pp] [prep] some	21
13	which have been [vb pp] to [det]	17
14	which have been [vb pp] to [det]	17
15	which have been [vb pp] [prep] all	15
16	which have been [vb pp] for [det]	13
17	which have been [vb pp] for [det]	13
18	which have been [vb pp] with [det]	10
19	which have been [vb pp] [prep] such	10
20	which have been [vb pp] with [det]	10
21	which have been [vb pp] [prep] several	10
22	which have been used [prep] [det]	8
23	which have been [vb pp] [prep] most	8
24	which have been [vb pp] over [det]	7
25	which have been [vb pp] on [det]	7
26	which have been [vb pp] over [det]	7
27	which have been developed [prep] [det]	7
28	which have been [vb pp] on [det]	7
29	which have been [vb pp] [prep] another	6
30	which have been [vb pp] at [det]	5