SN4 ""

No	Pattern	Freq
1	[noun] who had been [verb] to	63
2	[noun pl] who had been [verb] to	32
3	[noun sg] who had been [verb] to	21
4	[prep] who had been [verb] to	12
5	of who had been [verb] to	12
6	of who had been [verb] to	12
7	[prep] who had been [verb] to	12
8	[adj] who had been [verb] to	10
9	[det] who had been [verb] to	7
10	[noun prp] who had been [verb] to	7
11	those who had been [verb] to	6
12	those who had been [verb] to	6
13	who had [adv] been [verb] to	19
14	who had [adv] been [verb] to	13
15	who had [not/n't] been [verb] to	6
16	who had not been [verb] to	6
17	who had not been [verb] to	5
18	who had been [verb] [adv] to	10
19	who had been [verb] [adv prt] to	7
20	who had been [verb] to [art]	51
21	who had been [verb] to [art]	51
22	who had been [verb] to [noun]	44
23	who had been [verb] to the	42
24	who had been [verb] to the	42
25	who had been [verb] to [noun prp]	24
26	who had been [verb] to [be]	21
27	who had been [verb] to be	21
28	who had been [verb] to [be]	21
29	who had been [verb] to be	21
30	who had been [verb] to [noun sg]	18