देना ( it shows Have to in english you can also say "am to') देता ( it shows Present indefinite as above examples)

मुझे देना है ( I have to give) = (Inner compulsion construction) मैं देता (m )/ देती (f) हूँ ( I give) = Present simple

देना is an infinitive aka unconjugated verb to conjugate it to simple present tense ( I give) you drop the ना then you add ता for masculine gender or ती for feminine or also ते for masculine plural for example मैं देता हूँ (I give masc. sing) हम देते हैं ( we give masc. plural) वह देती है (fem. sing)

I have to give him some money. He gives me some money. मुझे उसे कुछ पैसे देने हैं । वह मुझे कुछ पैसे देता है । mujhe use kuch paise dene hain । veh mujhe kuch paise deta hai ।