SN4 ""

No	Pattern	Freq
1	it have been [art] [noun sg]	561
2	it have been a [noun]	378
3	it had been [art] [noun]	308
4	it has been [art] [noun]	158
5	it have been the [noun]	156
6	it 's been [art] [noun]	105
7	it have been an [noun]	46
8	it have been [art] mistake	21
9	it have been [art] mistake	21
10	it have been [art] bit	18
11	it have been [art] bit	18
12	it have been [art] while	13
13	it have been [art] matter	13
14	it have been [art] pleasure	13
15	it have been [art] pleasure	13
16	it have been [art] while	13
17	it have been [art] matter	13
18	it have been [art] [noun prp]	12
19	it have been [art] [noun pl]	10
20	it have been [art] year	8
21	it have been [art] [noun]	8
22	it have been [art] shock	8
23	it have been [art] year	8
24	it have been [art] shock	8
25	it have been [art] lot	7
26	it have been [art] privilege	7
27	it have been [art] day	7
28	it have been [art] question	7
29	it have been [art] lot	7
30	it have been [art] privilege	7