SN4 ""

No	Pattern	Freq
1	[verb] if they [modal v]	367
2	[noun] if they [modal v]	202
3	[adv] if they [modal v]	136
4	[conj] if they [modal v]	132
5	[noun sg] if they [modal v]	120
6	[adv] if they [modal v]	111
7	see if they [modal v]	109
8	[prep] if they [modal v]	103
9	[prep] if they [modal v]	103
10	[to-vb] if they [modal v]	98
11	as if they [modal v]	97
12	as if they [modal v]	97
13	[coord] if they [modal v]	94
14	[vb base] if they [modal v]	92
15	ask if they [modal v]	85
16	to see if they [modal v]	71
17	[noun pl] if they [modal v]	67
18	[adj] if they [modal v]	65
19	and if they [modal v]	61
20	[pron] if they [modal v]	61
21	and if they [modal v]	61
22	wonder if they [modal v]	56
23	[vb past] if they [modal v]	54
24	[adj] if they [modal v]	50
25	even if they [modal v]	50
26	even if they [modal v]	50
27	[vb infin] if they [modal v]	48
28	[pers pn] if they [modal v]	44
29	[vb pp] if they [modal v]	39
30	asked if they [modal v]	29