SN4 ""

No	Pattern	Freq
1	[noun] occur when	249
2	[noun sg] occur when	188
3	[adv] occur when	69
4	[adv] occur when	67
5	[adj] occur when	58
6	[noun pl] occur when	56
7	[pron] occur when	50
8	[modal v] occur when	48
9	[vb mod] occur when	48
10	[det] occur when	39
11	[Wh det] occur when	38
12	which occur when	35
13	which occur when	35
14	[conj] occur when	32
15	this occur when	31
16	this occur when	31
17	that occur when	29
18	that occur when	29
19	[that] occur when	29
20	[verb] occur when	26
21	can occur when	23
22	can occur when	23
23	only occur when	19
24	only occur when	19
25	may occur when	15
26	may occur when	15
27	[adj] occur when	13
28	have occur when	12
29	[pers pn] occur when	12
30	likely occur when	11