Final answer:
To say 'You (informal) help' in Spanish, you would say 'Tú ayudas'.
Step-by-step explanation:
To say 'You (informal) help' in Spanish, you would say 'Tú ayudas'. In Spanish, the verb 'ayudar' means 'to help' and when addressing someone using the informal 'you', which is 'tú', the correct form of the verb is 'ayudas'. The sentence would be: 'Tú ayudas'.
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