SN4 ""

No	Pattern	Freq
1	[verb] to do what	219
2	[noun] to do what	143
3	[noun sg] to do what	104
4	[adj] to do what	77
5	[adj] to do what	67
6	[vb pp] to do what	54
7	[pron] to do what	47
8	have to do what	45
9	[pers pn] to do what	43
10	[v-ing] to do what	42
11	[vb base] to do what	39
12	[adv] to do what	33
13	[vb past] to do what	33
14	[vb infin] to do what	32
15	[noun pl] to do what	25
16	want to do what	23
17	go to do what	21
18	[adv] to do what	21
19	going to do what	20
20	be to do what	19
21	able to do what	19
22	able to do what	19
23	[be] to do what	19
24	try to do what	17
25	have to do what	17
26	[vb -s] to do what	16
27	[is] to do what	14
28	have to do what	13
29	is to do what	13
30	free to do what	13