SN4 ""

No	Pattern	Freq
1	which have been [vb pp]	4261
2	which had been [verb]	2021
3	which has been [verb]	1483
4	which have been [verb]	1120
5	which have been [v-ing]	361
6	which have been make	124
7	which have been made	117
8	which have been used	103
9	which have been use	103
10	which have been set	79
11	which have been set	79
12	which have been develop	75
13	which have been developed	70
14	which have been build	60
15	which have been take	60
16	which have been give	56
17	which have been taken	54
18	which have been given	54
19	which have been built	51
20	which have been establish	50
21	which have been established	49
22	which have been described	44
23	which have been describe	44
24	which have been put	42
25	which have been put	42
26	which have been show	41
27	which have been shown	40
28	which have been left	38
29	which have been found	38
30	which have been leave	38