SN4 ""

No	Pattern	Freq
1	[conj] it [modal v] have been [adj]	212
2	[coord] it [modal v] have been [adj]	91
3	[verb] it [modal v] have been [adj]	79
4	[noun] it [modal v] have been [adj]	76
5	[adv] it [modal v] have been [adj]	69
6	that it [modal v] have been [adj]	64
7	that it [modal v] have been [adj]	64
8	[that] it [modal v] have been [adj]	64
9	[adv] it [modal v] have been [adj]	61
10	[noun sg] it [modal v] have been [adj]	61
11	[subord] it [modal v] have been [adj]	57
12	and it [modal v] have been [adj]	43
13	but it [modal v] have been [adj]	43
14	and it [modal v] have been [adj]	43
15	but it [modal v] have been [adj]	43
16	[vb base] it [modal v] have been [adj]	38
17	think it [modal v] have been [adj]	28
18	[vb past] it [modal v] have been [adj]	17
19	[adj] it [modal v] have been [adj]	17
20	[no cls] it [modal v] have been [adj]	15
21	[unc] it [modal v] have been [adj]	15
22	think it [modal v] have been [adj]	13
23	say it [modal v] have been [adj]	12
24	[pron] it [modal v] have been [adj]	12
25	[noun pl] it [modal v] have been [adj]	9
26	[adj] it [modal v] have been [adj]	9
27	perhaps it [modal v] have been [adj]	9
28	so it [modal v] have been [adj]	9
29	perhaps it [modal v] have been [adj]	9
30	[Wh det] it [modal v] have been [adj]	9