SN4 ""

No	Pattern	Freq
1	[vb mod] have become [adj]	101
2	[modal v] have become [adj]	101
3	may have become [adj]	26
4	[adv] have become [adj]	26
5	may have become [adj]	26
6	[adv] have become [adj]	21
7	would have become [adj]	21
8	would have become [adj]	21
9	should have become [adj]	14
10	should have become [adj]	14
11	will have become [adj]	13
12	will have become [adj]	13
13	must have become [adj]	12
14	must have become [adj]	12
15	might have become [adj]	8
16	might have become [adj]	8
17	well have become [adj]	7
18	well have become [adj]	7
19	could have become [adj]	6
20	could have become [adj]	6
21	not have become [adj]	5
22	[not/n't] have become [adj]	5
23	have become [art] [adj]	31
24	have become [adv] [adj]	31
25	have become [art] [adj]	31
26	have become [adv] [adj]	31
27	have become a [adj]	22
28	have become a [adj]	14
29	have become an [adj]	8
30	have become more [adj]	8