SN4 ""

No	Pattern	Freq
1	[pron] [verb] it have been [v-ing]	17
2	[pers pn] [verb] it have been [v-ing]	16
3	[noun] [verb] it have been [v-ing]	10
4	i [verb] it have been [v-ing]	7
5	i [verb] it have been [v-ing]	7
6	[noun sg] [verb] it have been [v-ing]	5
7	[verb] [conj] it have been [v-ing]	12
8	[verb] that it have been [v-ing]	7
9	[verb] that it have been [v-ing]	7
10	[verb] [that] it have been [v-ing]	7
11	[verb] it [pron] have been [v-ing]	8
12	[verb] it [pers pn] have been [v-ing]	7
13	[verb] it [modal v] have been [v-ing]	5
14	[verb] it [vb mod] have been [v-ing]	5
15	[verb] it have been [v-ing] [adv]	16
16	[verb] it have been [v-ing] [adv prt]	10
17	[verb] it have been [v-ing] on	8
18	[verb] it have been [v-ing] on	8
19	[verb] it have been [v-ing] [prep]	7
20	[verb] it have been [v-ing] [prep]	7
21	[verb] it have been [v-ing] [adv]	6