SN4 ""

No	Pattern	Freq
1	who had [vb pp] [adj] [noun]	215
2	who had [verb] [adj] [noun sg]	120
3	who had [verb] [adj] [noun pl]	93
4	who had have [adj] [noun]	32
5	who had had [adj] [noun]	32
6	who had undergone [adj] [noun]	11
7	who had undergo [adj] [noun]	11
8	who had become [adj] [noun]	10
9	who had make [adj] [noun]	10
10	who had suffer [adj] [noun]	10
11	who had suffered [adj] [noun]	10
12	who had receive [adj] [noun]	10
13	who had become [adj] [noun]	10
14	who had received [adj] [noun]	10
15	who had made [adj] [noun]	9
16	who had [verb] [adj] surgery	8
17	who had hold [adj] [noun]	8
18	who had [verb] [adj] surgery	8
19	who had held [adj] [noun]	8
20	who had [to-vb] [adj] [noun]	7
21	who had take [adj] [noun]	7
22	who had [verb] [adj] [noun prp]	6
23	who had [verb] political [noun]	6
24	who had [verb] similar [noun]	6
25	who had taken [adj] [noun]	6
26	who had [verb] considerable [noun]	5
27	who had [verb] [adj] experience	5
28	who had achieve [adj] [noun]	5
29	who had achieved [adj] [noun]	5
30	who had [verb] previous [noun]	5