SN4 ""

No	Pattern	Freq
1	[subord] at [noun sg]	507
2	[subord] at present	166
3	as at [noun sg]	136
4	than at [noun sg]	133
5	[subord] at home	91
6	while at [noun sg]	48
7	when at [noun sg]	45
8	whether at [noun sg]	33
9	[subord] at school	20
10	[subord] at work	19
11	because at [noun sg]	19
12	although at [noun sg]	17
13	[subord] at night	15
14	whilst at [noun sg]	11
15	[subord] at point	11
16	whereas at [noun sg]	11
17	[subord] at university	10
18	except at [noun sg]	10
19	[subord] at rest	10
20	though at [noun sg]	9
21	if at [noun sg]	9
22	where at [noun sg]	8
23	[subord] at christmas	7
24	[subord] at length	7
25	until at [noun sg]	5
26	[subord] at sea	5