SN4 ""

No	Pattern	Freq
1	[adv] [vb pp] at the time	144
2	[adv] [verb] at the time	142
3	not [verb] at the time	82
4	[not/n't] [verb] at the time	82
5	not [verb] at the time	48
6	[adv] [vb infin] at the time	46
7	n't [verb] at the time	34
8	[adv] know at the time	24
9	[adv] know at the time	15
10	[adv] [v-ing] at the time	14
11	[adv] [vb past] at the time	14
12	widely [verb] at the time	10
13	widely [verb] at the time	10
14	[adv] realise at the time	9
15	well [verb] at the time	8
16	actually [verb] at the time	8
17	actually [verb] at the time	8
18	well [verb] at the time	8
19	[adv] known at the time	8
20	[adv] think at the time	7
21	still [verb] at the time	7
22	fully [verb] at the time	7
23	fully [verb] at the time	7
24	[adv] realise at the time	7
25	still [verb] at the time	7
26	[adv] appreciate at the time	6
27	[adv] investigated at the time	6
28	[adv] investigate at the time	6
29	[adv] notice at the time	5
30	often [verb] at the time	5