SN4 ""

No	Pattern	Freq
1	at a [adj] time	380
2	at a [adj] time	380
3	at a [adj] time	309
4	at a [adj -er] time	70
5	at a particular time	67
6	at a particular time	67
7	at a given time	37
8	at a given time	37
9	at a certain time	33
10	at a certain time	33
11	at a late time	32
12	at a later time	32
13	at a bad time	28
14	at a good time	26
15	at a better time	20
16	at a different time	18
17	at a different time	18
18	at a worse time	17
19	at a crucial time	15
20	at a crucial time	15
21	at a difficult time	13
22	at a difficult time	13
23	at a specific time	12
24	at a specific time	12
25	at a critical time	11
26	at a critical time	11
27	at a convenient time	10
28	at a convenient time	10
29	at a bad time	10
30	at a specified time	9