SN4 ""

No	Pattern	Freq
1	[prep] if [pers pn] [verb]	3115
2	as if [pers pn] [verb]	2856
3	[prep] if [pers pn] [vb past]	2444
4	[prep] if [pers pn] have	1891
5	[prep] if [pers pn] had	1206
6	[prep] if he [verb]	952
7	[prep] if she [verb]	558
8	[prep] if [pers pn] [vb base]	487
9	[prep] if they [verb]	448
10	[prep] if it [verb]	421
11	[prep] if [pers pn] 'd	336
12	[prep] if i [verb]	317
13	[prep] if you [verb]	301
14	[prep] if [pers pn] do	220
15	[prep] if [pers pn] [vb -s]	183
16	[prep] if [pers pn] did	160
17	[prep] if [pers pn] 've	143
18	[prep] if we [verb]	114
19	[prep] if [pers pn] know	101
20	[prep] if [pers pn] have	100
21	[prep] if [pers pn] want	97
22	[prep] if [pers pn] knew	88
23	[prep] if [pers pn] wanted	62
24	[prep] if [pers pn] need	62
25	[prep] if [pers pn] has	62
26	[prep] if [pers pn] do	48
27	to if [pers pn] [verb]	47
28	about if [pers pn] [verb]	46
29	[prep] if [pers pn] 's	43
30	[prep] if [pers pn] think	40