As a support main what do I do if I have to work with an incompetent adc?

I haven't been playing support for a long time maybe about 1-2 months I still have much to learn and the role fits my play style but someone I meet adc players who 1. have never played adc or 2. Is just horrible at adc? So what do I do in a situation in which my adc keeps feeding and stuff or never goes in when the jungle engages a good timed gank?
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