SN4 ""

No	Pattern	Freq
1	[noun] while at	148
2	[noun sg] while at	93
3	[noun pl] while at	35
4	[verb] while at	21
5	[vb pp] while at	13
6	[noun prp] while at	12
7	[adv] while at	12
8	[adv] while at	10
9	[n mass] while at	8
10	[conj] while at	8
11	[coord] while at	6
12	while [verb] at	112
13	while [v-ing] at	100
14	while [adv] at	35
15	while [adv] at	32
16	while still at	29
17	while still at	29
18	while [noun] at	18
19	while working at	17
20	while work at	17
21	while [vb pp] at	12
22	while looking at	10
23	while [noun pl] at	10
24	while look at	10
25	while [noun sg] at	7
26	while staying at	7
27	while stay at	7
28	while sitting at	5
29	while studying at	5
30	while study at	5