Ég lofa að hringja í þig á morgun.

I promise to call you tomorrow.

Breakdown of Ég lofa að hringja í þig á morgun.

• ég: I
• þú: you
• á morgun: tomorrow
• að: to

Questions & Answers about Ég lofa að hringja í þig á morgun.

Why does the sentence start with Ég? Can I leave it out like in some languages?

Icelandic normally keeps the subject pronoun, so Ég lofa... is the standard, neutral way to say it. You can drop ég in very informal speech (especially if it’s obvious from context), but it’s much less common than in languages like Spanish or Italian.

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What tense is lofa here, and how is it conjugated?

Lofa is the present tense, 1st person singular: ég lofa = I promise.
The present tense of lofa is:

• ég lofa
• þú lofar
• hann/hún/það lofar
• við lofum
• þið lofið
• þeir/þær/þau lofa

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Why is there an að before hringja? What does að do?

Here að introduces an infinitive clause: lofa að + infinitive = promise to + verb.
So Ég lofa að hringja... literally means I promise to call....
This að is very common after many verbs that take an infinitive (similar to English to).

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Is að hringja like an infinitive phrase? What form is hringja?