SN4 ""

No	Pattern	Freq
1	it have been [vb pp] [adv] [prep]	112
2	it has been [vb pp] [adv] [prep]	47
3	it had been [vb pp] [adv] [prep]	45
4	it have been [vb pp] [adv] by	25
5	it have been [vb pp] [adv] by	25
6	it have been [vb pp] [adv] in	25
7	it have been [vb pp] [adv] in	25
8	it 's been [vb pp] [adv] [prep]	18
9	it have been [vb pp] [adv] for	13
10	it have been [vb pp] [adv] for	13
11	it have been [vb pp] [adv] to	11
12	it have been [vb pp] [adv] to	11
13	it have been [vb pp] away [prep]	8
14	it have been [vb pp] [adv] from	7
15	it have been [vb pp] [adv] from	7
16	it have been used [adv] [prep]	7
17	it have been [vb pp] [adv] on	7
18	it have been [vb pp] [adv] on	7
19	it have been [vb pp] there [prep]	6
20	it have been [vb pp] twice [prep]	6
21	it have been done [adv] [prep]	5
22	it have been taken [adv] [prep]	5
23	it have been [vb pp] originally [prep]	5