SN4 ""

No	Pattern	Freq
1	[conj] it have been [adj]	243
2	[subord] it have been [adj]	112
3	[noun] it have been [adj]	87
4	[coord] it have been [adj]	72
5	[adv] it have been [adj]	71
6	[that] it have been [adj]	59
7	that it have been [adj]	59
8	that it have been [adj]	59
9	[verb] it have been [adj]	54
10	if it have been [adj]	53
11	if it have been [adj]	53
12	[noun sg] it have been [adj]	51
13	[adv] it have been [adj]	49
14	and it have been [adj]	40
15	and it have been [adj]	40
16	but it have been [adj]	32
17	[noun pl] it have been [adj]	32
18	but it have been [adj]	32
19	[adj] it have been [adj]	19
20	[vb past] it have been [adj]	18
21	say it have been [adj]	18
22	[Wh adv] it have been [adj]	17
23	[modal v] it have been [adj]	16
24	[vb mod] it have been [adj]	16
25	[pron] it have been [adj]	15
26	[prep] it have been [adj]	13
27	[prep] it have been [adj]	13
28	[num] it have been [adj]	12
29	[vb -s] it have been [adj]	12
30	would it have been [adj]	11