SN4 ""

No	Pattern	Freq
1	[verb] [to-vb] [prep] the problem	93
2	[noun] [to-vb] [prep] the problem	87
3	[noun sg] [to-vb] [prep] the problem	55
4	[adj] [to-vb] [prep] the problem	31
5	[vb pp] [to-vb] [prep] the problem	31
6	[adj] [to-vb] [prep] the problem	27
7	[noun pl] [to-vb] [prep] the problem	25
8	have [to-vb] [prep] the problem	21
9	[adv] [to-vb] [prep] the problem	19
10	[vb past] [to-vb] [prep] the problem	19
11	[vb -s] [to-vb] [prep] the problem	12
12	[pron] [to-vb] [prep] the problem	11
13	[v-ing] [to-vb] [prep] the problem	10
14	[vb base] [to-vb] [prep] the problem	10
15	[vb infin] [to-vb] [prep] the problem	8
16	[Wh adv] [to-vb] [prep] the problem	7
17	how [to-vb] [prep] the problem	7
18	how [to-vb] [prep] the problem	7
19	able [to-vb] [prep] the problem	7
20	[adv] [to-vb] [prep] the problem	7
21	able [to-vb] [prep] the problem	7
22	way [to-vb] [prep] the problem	6
23	[pers pn] [to-vb] [prep] the problem	6
24	has [to-vb] [prep] the problem	6
25	way [to-vb] [prep] the problem	6
26	need [to-vb] [prep] the problem	5
27	order [to-vb] [prep] the problem	5
28	go [to-vb] [prep] the problem	5
29	order [to-vb] [prep] the problem	5
30	going [to-vb] [prep] the problem	5