SN4 ""

No	Pattern	Freq
1	when they [vb past] [to-vb]	230
2	when they tried [to-vb]	37
3	when they came [to-vb]	29
4	when they began [to-vb]	22
5	when they wanted [to-vb]	15
6	when they had [to-vb]	15
7	when they went [to-vb]	14
8	when they failed [to-vb]	10
9	when they started [to-vb]	10
10	when they attempted [to-vb]	8
11	when they refused [to-vb]	7
12	when they [vb past] to do	6
13	when they decided [to-vb]	6
14	when they agreed [to-vb]	5
15	when they [vb past] to leave	5
16	when they arrived [to-vb]	5