SN4 ""

No	Pattern	Freq
1	[verb] if [art]	3403
2	[verb] if the	2836
3	[verb] if the	2836
4	[vb pp] if [art]	1266
5	[vb infin] if [art]	742
6	[to-vb] if [art]	567
7	[verb] if a	534
8	[verb] if a	448
9	see if [art]	313
10	[vb base] if [art]	310
11	to see if [art]	226
12	wonder if [art]	223
13	[vb -s] if [art]	194
14	[vb past] if [art]	183
15	happen if [art]	152
16	[v-ing] if [art]	141
17	know if [art]	138
18	ask if [art]	102
19	wondered if [art]	87
20	[verb] if an	86
21	say if [art]	75
22	do if [art]	70
23	occur if [art]	68
24	arise if [art]	68
25	happen if [art]	63
26	apply if [art]	60
27	wonder if [art]	58
28	know if [art]	57
29	happens if [art]	50
30	see if [art]	50