SN4 ""

No	Pattern	Freq
1	it be [adj] [prep] this [noun]	134
2	it be [adj] [prep] this [noun sg]	133
3	it be [adj] [prep] this [noun]	128
4	it is [adj] [prep] this [noun]	102
5	it be [adj] at this [noun]	47
6	it be [adj] in this [noun]	31
7	it be [adj] [prep] this stage	22
8	it be [adj] [prep] this stage	22
9	it be [adj] from this [noun]	18
10	it was [adj] [prep] this [noun]	16
11	it be [adj] [prep] this point	15
12	it 's [adj] [prep] this [noun]	15
13	it be important [prep] this [noun]	15
14	it be important [prep] this [noun]	15
15	it be [adj] [prep] this point	15
16	it be clear [prep] this [noun]	14
17	it be clear [prep] this [noun]	14
18	it be [adj] for this [noun]	13
19	it be appropriate [prep] this [noun]	10
20	it be appropriate [prep] this [noun]	10
21	it be [adj] to this [noun]	10
22	it be [adj] [prep] this case	7
23	it be [adj] [prep] this case	7
24	it be [adj] on this [noun]	6
25	it be helpful [prep] this [noun]	6
26	it be helpful [prep] this [noun]	6
27	it be possible [prep] this [noun]	5
28	it be possible [prep] this [noun]	5
29	it be [adj] [prep] this time	5
30	it be [adj] [prep] this time	5