SN4 ""

No	Pattern	Freq
1	[noun] [prep] the period when	22
2	[noun sg] [prep] the period when	14
3	[verb] [prep] the period when	12
4	[adv] [prep] the period when	11
5	[adv] [prep] the period when	8
6	[noun pl] [prep] the period when	8
7	[prep] the [adj] period when	25
8	[prep] the [adj] period when	22
9	[prep] the period from when	6
10	[prep] the period from when	6
11	[prep] the period [prep] when	6
12	[prep] the period [prep] when	6
13	[prep] the period when [art]	21
14	[prep] the period when [art]	21
15	[prep] the period when the	20
16	[prep] the period when the	20
17	[prep] the period when [noun]	16
18	[prep] the period when [pron]	12
19	[prep] the period when [pers pn]	12
20	[prep] the period when [adj]	10
21	[prep] the period when he	6
22	[prep] the period when he	6
23	[prep] the period when [noun prp]	6
24	[prep] the period when [noun sg]	5
25	[prep] the period when [det]	5