SN4 ""

No	Pattern	Freq
1	had [vb pp] [prep] the [num]	140
2	had [vb pp] in the [num]	69
3	had [vb pp] [prep] the two	24
4	had [vb pp] [prep] the 1960s	12
5	had [vb pp] [prep] the 1930s	11
6	had [vb pp] between the [num]	9
7	had done [prep] the [num]	9
8	had [vb pp] since the [num]	7
9	had [vb pp] [prep] the 1950s	7
10	had [vb pp] to the [num]	7
11	had [vb pp] [prep] the 1920s	7
12	had [vb pp] during the [num]	7
13	had happened [prep] the [num]	6
14	had come [prep] the [num]	6
15	had developed [prep] the [num]	5
16	had [vb pp] through the [num]	5
17	had [vb pp] [prep] the 1970s	5
18	had [vb pp] [prep] the 1980s	5
19	had [vb pp] from the [num]	5
20	had emerged [prep] the [num]	5