SN4 ""

No	Pattern	Freq
1	[verb] at a [noun sg]	4198
2	[verb] at a [noun sg]	3830
3	[vb pp] at a [noun sg]	1503
4	[v-ing] at a [noun sg]	911
5	[vb past] at a [noun sg]	645
6	look at a [noun sg]	440
7	[verb] at an [noun sg]	368
8	[to-vb] at a [noun sg]	351
9	[verb] at a time	345
10	[vb base] at a [noun sg]	282
11	[vb infin] at a [noun sg]	258
12	[vb -s] at a [noun sg]	248
13	arrive at a [noun sg]	192
14	looking at a [noun sg]	179
15	[verb] at a rate	172
16	[verb] at a meeting	165
17	sit at a [noun sg]	147
18	come at a [noun sg]	115
19	[verb] at a table	113
20	speak at a [noun sg]	88
21	sitting at a [noun sg]	83
22	[verb] at a cost	81
23	[verb] at a distance	79
24	[verb] at a angle	76
25	work at a [noun sg]	73
26	stop at a [noun sg]	72
27	to look at a [noun sg]	66
28	speaking at a [noun sg]	66
29	look at a [noun sg]	65
30	[verb] at a glance	64