SN4 ""

No	Pattern	Freq
1	[adv] know at the time	24
2	[not/n't] know at the time	19
3	not know at the time	19
4	[pron] know at the time	15
5	[pers pn] know at the time	14
6	n't know at the time	12
7	be know at the time	8
8	[be] know at the time	8
9	[noun] know at the time	7
10	not know at the time	7
11	[adv] know at the time	5
12	[noun pl] know at the time	5
13	i know at the time	5
14	i know at the time	5
15	know [pron] at the time	16
16	know [pers pn] at the time	16
17	know it at the time	15
18	know it at the time	15
19	know [det] at the time	5
20	know [adj] at the time	5
21	know at the [adj] time	7
22	know at the [det] time	6
23	know at the same time	6
24	know at the same time	6
25	know at the time [prep]	16
26	know at the time [prep]	16
27	know at the time [conj]	14
28	know at the time of	11
29	know at the time of	11
30	know at the time that	10