SN4 ""

No	Pattern	Freq
1	which [vb mod] [verb] to be	196
2	which [vb mod] [vb infin] to be	195
3	which [vb mod] have to be	82
4	which [vb mod] have to be	82
5	which would [verb] to be	75
6	which will [verb] to be	58
7	which [vb mod] need to be	42
8	which [vb mod] need to be	42
9	which may [verb] to be	39
10	which [vb mod] prove to be	16
11	which [vb mod] seem to be	16
12	which [vb mod] prove to be	16
13	which [vb mod] seem to be	16
14	which [vb mod] appear to be	11
15	which [vb mod] continue to be	10
16	which [vb mod] appear to be	10
17	which [vb mod] continue to be	10
18	which might [verb] to be	8
19	which can [verb] to be	6
20	which could [verb] to be	5