SN4 ""

No	Pattern	Freq
1	[prep] [pers pn] at a time	13
2	[prep] [pers pn] at a time	13
3	[verb] [pers pn] at a time	12
4	[to-vb] [pers pn] at a time	5
5	[pers pn] [verb] at a time	24
6	[pers pn] one at a time	17
7	[pers pn] [pron] at a time	17
8	[pers pn] [indef pn] at a time	17
9	[pers pn] one at a time	17
10	[pers pn] [vb past] at a time	14
11	[pers pn] come at a time	7
12	[pers pn] was at a time	7
13	[pers pn] be at a time	7
14	[pers pn] [was/were] at a time	7
15	[pers pn] [be] at a time	7
16	[pers pn] [vb -s] at a time	6
17	[pers pn] at a [adj] time	11
18	[pers pn] at a [adj] time	11
19	[pers pn] at a time [adv]	17
20	[pers pn] at a time [Wh adv]	16
21	[pers pn] at a time when	16
22	[pers pn] at a time when	16