SN4 ""

No	Pattern	Freq
1	[pron] have been [v-ing] on for	47
2	[noun] have been [v-ing] on for	37
3	[pers pn] have been [v-ing] on for	33
4	[noun sg] have been [v-ing] on for	23
5	it have been [v-ing] on for	19
6	it have been [v-ing] on for	19
7	[Wh det] have been [v-ing] on for	13
8	which have been [v-ing] on for	12
9	which have been [v-ing] on for	12
10	[det] have been [v-ing] on for	10
11	[adj] have been [v-ing] on for	10
12	[noun pl] have been [v-ing] on for	9
13	that have been [v-ing] on for	7
14	[that] have been [v-ing] on for	7
15	that have been [v-ing] on for	7
16	this have been [v-ing] on for	7
17	[conj] have been [v-ing] on for	7
18	this have been [v-ing] on for	7
19	[noun prp] have been [v-ing] on for	5
20	have [adv] been [v-ing] on for	7
21	have [adv] been [v-ing] on for	6
22	have been [v-ing] on [adv] for	8
23	have been [v-ing] on [adv] for	6
24	have been [v-ing] on now for	5
25	have been [v-ing] on now for	5
26	have been [v-ing] on for [adj]	38
27	have been [v-ing] on for [noun]	28
28	have been [v-ing] on for [noun pl]	27
29	have been [v-ing] on for [det]	23
30	have been [v-ing] on for [adv]	20