SN4 ""

No	Pattern	Freq
1	which [verb] to be	1421
2	which [verb] to be	1421
3	which [verb] to be	1419
4	which [vb -s] to be	497
5	which [vb past] to be	476
6	which have to be	465
7	which [vb base] to be	448
8	which need to be	268
9	which seem to be	188
10	which had to be	177
11	which has to be	158
12	which need to be	155
13	which appear to be	137
14	which have to be	130
15	which needs to be	85
16	which seemed to be	79
17	which seems to be	72
18	which tend to be	72
19	which prove to be	58
20	which appears to be	58
21	which happen to be	52
22	which proved to be	50
23	which appear to be	42
24	which appeared to be	37
25	which seem to be	37
26	which tends to be	32
27	which come to be	29
28	which claim to be	29
29	which tend to be	28
30	which needed to be	28