SN4 ""

No	Pattern	Freq
1	[noun] which had to [be]	104
2	[noun sg] which had to [be]	58
3	[noun pl] which had to [be]	46
4	[prep] which had to [be]	11
5	[prep] which had to [be]	11
6	of which had to [be]	9
7	of which had to [be]	9
8	[pron] which had to [be]	6
9	[adv] which had to [be]	5
10	[indef pn] which had to [be]	5
11	which [adv] had to [be]	14
12	which [adv] had to [be]	14
13	which [pers pn] had to [be]	7
14	which [pron] had to [be]	7
15	which [noun] had to [be]	6
16	which had [verb] to [be]	18
17	which had [vb pp] to [be]	18
18	which had [adv] to [be]	8
19	which had [adv] to [be]	8
20	which had to [be] [verb]	149
21	which had to [be] [vb pp]	147
22	which had to [be] [adv]	13
23	which had to [be] [adv]	12
24	which had to [be] [adj]	9
25	which had to [be] [adj]	8
26	which had to [be] taken	5
27	which had to [be] take	5