SN4 ""

No	Pattern	Freq
1	[verb] to refer to	268
2	[vb pp] to refer to	121
3	[noun] to refer to	119
4	[adj] to refer to	110
5	[adj] to refer to	101
6	[noun sg] to refer to	93
7	use to refer to	69
8	used to refer to	68
9	[vb base] to refer to	50
10	[adv] to refer to	47
11	[vb infin] to refer to	34
12	[adv] to refer to	30
13	have to refer to	28
14	[vb past] to refer to	27
15	[vb mod] to refer to	25
16	[modal v] to refer to	25
17	used to refer to	24
18	used to refer to	24
19	[noun pl] to refer to	22
20	[v-ing] to refer to	19
21	need to refer to	17
22	want to refer to	16
23	[vb -s] to refer to	16
24	necessary to refer to	15
25	necessary to refer to	15
26	[be] to refer to	14
27	able to refer to	14
28	want to refer to	14
29	be to refer to	14
30	able to refer to	14