SN4 ""

No	Pattern	Freq
1	it have been [vb pp]	5668
2	it has be [vb pp]	3465
3	it had be [vb pp]	1541
4	it 's be [vb pp]	611
5	it have be suggested	513
6	it have be argued	226
7	it have be shown	212
8	it have be said	152
9	it have be estimated	144
10	it have be found	114
11	it have be used	109
12	it have be held	107
13	it have be made	93
14	it have be done	88
15	it have be decided	82
16	it have be claimed	78
17	it have be known	73
18	it have be reported	61
19	it have be given	52
20	it have be taken	51
21	it have be assumed	51
22	it have be established	50
23	it have be agreed	48
24	it have be seen	44
25	it have be pointed	44
26	it have be built	43
27	it have be proposed	41
28	it have be designed	38
29	it have be put	37
30	it have be left	36