Questions about Infinitives
Q: Why is it tenho falado and NOT tenho falar?
Infinitives (like falar, sair, vender, etc.) do not follow auxiliary verbs such as ter or haver. In these cases, the verb appears as a past participle (falado, saído, vendido).
Q: Why is it quero falar contigo and NOT quero falo contigo?
You generally do not have two conjugated verbs in a row. The second verb should be in the infinitive.