SN4 ""

No	Pattern	Freq
1	[conj] it have been [verb] for	66
2	[conj] it have been [vb pp] for	51
3	[subord] it have been [verb] for	41
4	[conj] it has been [verb] for	28
5	[conj] it had been [verb] for	23
6	[conj] it have been [v-ing] for	15
7	[coord] it have been [verb] for	15
8	[conj] it 's been [verb] for	14
9	that it have been [verb] for	10
10	[that] it have been [verb] for	10
11	if it have been [verb] for	10
12	if it have been [verb] for	10
13	that it have been [verb] for	10
14	as it have been [verb] for	8
15	as it have been [verb] for	8
16	but it have been [verb] for	8
17	but it have been [verb] for	8
18	and it have been [verb] for	7
19	and it have been [verb] for	7
20	[conj] it have been known for	6
21	[conj] it have been know for	6
22	when it have been [verb] for	5
23	[conj] it have been use for	5
24	[conj] it have been used for	5
25	when it have been [verb] for	5
26	[conj] it have been do for	5