SN4 ""

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