SN4 ""

No	Pattern	Freq
1	[was/were] [v-ing] at the [noun]	658
2	[was/were] [v-ing] at the [noun sg]	549
3	was [v-ing] at the [noun]	511
4	were [v-ing] at the [noun]	147
5	[was/were] looking at the [noun]	107
6	[was/were] standing at the [noun]	82
7	[was/were] [v-ing] at the [noun pl]	73
8	[was/were] [v-ing] at the time	66
9	[was/were] [v-ing] at the time	65
10	[was/were] sitting at the [noun]	55
11	[was/were] staring at the [noun]	47
12	[was/were] [v-ing] at the door	32
13	[was/were] [v-ing] at the door	32
14	[was/were] [v-ing] at the [noun prp]	32
15	[was/were] working at the [noun]	26
16	[was/were] waiting at the [noun]	26
17	[was/were] [v-ing] at the table	24
18	[was/were] [v-ing] at the table	24
19	[was/were] staying at the [noun]	17
20	[was/were] [v-ing] at the back	17
21	[was/were] [v-ing] at the back	17
22	[was/were] [v-ing] at the end	16
23	[was/were] [v-ing] at the end	16
24	[was/were] [v-ing] at the window	16
25	[was/were] [v-ing] at the top	15
26	[was/were] [v-ing] at the top	15
27	[was/were] speaking at the [noun]	12
28	[was/were] [v-ing] at the window	12
29	[was/were] happening at the [noun]	11
30	[was/were] living at the [noun]	10