Learn Spanish (Spain): Me da rabia que tú nunca pagues las facturas. - It makes me angry that you never pay the bills.

The phrase Me da rabia expresses a strong emotion (it makes me angry). In Spanish, when you express an emotion about someone else's action, you use que followed by the subjunctive mood. Here, you are reacting to what the other person does, which triggers the subjunctive form pagues.

Why is it spelled pagues instead of 'pages'?

The verb is pagar. To form the subjunctive for tú, we normally swap the -ar ending for -es. However, if we wrote 'pages', the letter g before an e would sound like a Spanish j (like an English 'h'). To keep the hard 'g' sound from pagar, we must insert a u, making it pagues.

Could I say 'Me da rabia que tú nunca pagas' with the normal present tense?

No, that would sound incorrect. Expressions of emotion like dar rabia, dar pena, or molestar strictly require the subjunctive when there is a change of subject (from 'it' making me angry, to 'you' paying the bills).

Why is the pronoun tú included here when Spanish usually drops it?

While the ending of pagues already tells us 'you' are the one not paying, adding tú adds emphasis. In a sentence expressing anger or frustration like this one, throwing in the tú makes it sound much more accusatory: it makes me angry that you never pay the bills.