SN4 ""

No	Pattern	Freq
1	be [v-ing] at [noun sg]	359
2	[am/are] [v-ing] at [noun sg]	112
3	[was/were] [v-ing] at [noun sg]	99
4	[be] [v-ing] at home	93
5	[be] looking at [noun sg]	66
6	[is] [v-ing] at [noun sg]	66
7	was [v-ing] at [noun sg]	65
8	are [v-ing] at [noun sg]	60
9	is [v-ing] at [noun sg]	48
10	[be] [v-ing] at [noun sg]	43
11	be [v-ing] at [noun sg]	43
12	been [v-ing] at [noun sg]	39
13	[been] [v-ing] at [noun sg]	39
14	're [v-ing] at [noun sg]	36
15	were [v-ing] at [noun sg]	34
16	[be] sitting at [noun sg]	23
17	[be] working at [noun sg]	20
18	[be] living at [noun sg]	18
19	[be] [v-ing] at school	18
20	[be] [v-ing] at night	18
21	's [v-ing] at [noun sg]	18
22	[be] [v-ing] at present	17
23	'm [v-ing] at [noun sg]	16
24	[be] doing at [noun sg]	16
25	[be] staying at [noun sg]	15
26	[be] happening at [noun sg]	13
27	[be] studying at [noun sg]	11
28	[be] playing at [noun sg]	10
29	[be] [v-ing] at university	9
30	[be] operating at [noun sg]	8