SN4 ""

No	Pattern	Freq
1	[adv] [conj] [pers pn] have been at	21
2	[adj] [conj] [pers pn] have been at	20
3	[noun] [conj] [pers pn] have been at	18
4	[adv] [conj] [pers pn] have been at	17
5	[verb] [conj] [pers pn] have been at	15
6	[noun sg] [conj] [pers pn] have been at	15
7	[adj] [conj] [pers pn] have been at	11
8	[conj] [conj] [pers pn] have been at	5
9	[vb past] [conj] [pers pn] have been at	5
10	[conj] [conj] [pers pn] have been at	5
11	[conj] [pers pn] [vb mod] have been at	15
12	[conj] [pers pn] [modal v] have been at	15
13	[conj] [pers pn] have [adv] been at	15
14	[conj] [pers pn] have not been at	10
15	[conj] [pers pn] have [not/n't] been at	10
16	[conj] [pers pn] have n't been at	6
17	[conj] [pers pn] have [adv] been at	5
18	[conj] [pers pn] have been [verb] at	120
19	[conj] [pers pn] have been [vb pp] at	74
20	[conj] [pers pn] have been [v-ing] at	46
21	[conj] [pers pn] have been [adj] at	19
22	[conj] [pers pn] have been [adj] at	17
23	[conj] [pers pn] have been [adv] at	16
24	[conj] [pers pn] have been looking at	12
25	[conj] [pers pn] have been look at	12
26	[conj] [pers pn] have been [adv] at	9
27	[conj] [pers pn] have been [adv prt] at	7
28	[conj] [pers pn] have been work at	6
29	[conj] [pers pn] have been present at	5
30	[conj] [pers pn] have been working at	5