SN4 ""

No	Pattern	Freq
1	it become [adj]	1385
2	it became [adj]	900
3	it becomes [adj]	537
4	it become clear	395
5	it become clear	385
6	it become apparent	165
7	it become apparent	165
8	it become possible	90
9	it become possible	90
10	it become obvious	85
11	it become obvious	85
12	it become necessary	63
13	it become necessary	63
14	it become evident	60
15	it become evident	60
16	it become [adj -er]	54
17	it become difficult	33
18	it become difficult	33
19	it become [det]	30
20	it become available	26
21	it become available	26
22	it become impossible	23
23	it become [num]	23
24	it become impossible	23
25	it become [adj]	22
26	it become important	17
27	it become important	17
28	it become easy	16
29	it become more	16
30	it become more	16