SN4 ""

No	Pattern	Freq
1	a [noun sg] at the [noun]	3484
2	a [noun sg] at the [noun]	3141
3	a [noun sg] at the [noun sg]	2814
4	a [noun sg] at the [noun prp]	425
5	an [noun sg] at the [noun]	343
6	a look at the [noun]	336
7	a [noun sg] at the end	276
8	a [noun sg] at the end	276
9	a [noun sg] at the [noun pl]	220
10	a [noun sg] at the back	123
11	a [noun sg] at the back	123
12	a [noun sg] at the time	120
13	a [noun sg] at the time	119
14	a [noun sg] at the door	90
15	a [noun sg] at the door	90
16	a [noun sg] at the moment	89
17	a [noun sg] at the moment	89
18	a [noun sg] at the top	77
19	a [noun sg] at the top	77
20	a glance at the [noun]	74
21	a [noun sg] at the university	69
22	a [noun sg] at the university	69
23	a [noun sg] at the bottom	61
24	a [noun sg] at the bottom	61
25	a knock at the [noun]	50
26	a [noun sg] at the beginning	46
27	a [noun sg] at the beginning	46
28	a day at the [noun]	44
29	a [noun sg] at the centre	42
30	a [noun sg] at the centre	42