SN4 ""

No	Pattern	Freq
1	[adv] let they down	29
2	not let they down	22
3	[not/n't] let they down	22
4	[verb] let they down	16
5	n't let they down	14
6	have let they down	12
7	[vb past] let they down	8
8	had let they down	8
9	not let they down	8
10	[adv] let they down	7
11	[noun] let they down	7
12	[noun sg] let they down	6
13	let they [verb] down	10
14	let they [vb infin] down	10
15	let they down [prep]	7
16	let they down [prep]	7
17	let they down [adv]	5
18	let they down [adv]	5