Learn Icelandic: Manst þú að fundurinn er í dag? - Do you remember that the meeting is today?

The word að means "that" and acts as a bridge connecting the two parts of the sentence. As you are learning in this lesson, after að, the word order in the second clause usually stays exactly the same as a normal affirmative sentence: the subject (fundurinn) comes right before the verb (er).

Why does the verb for "remember" look like manst here?

The dictionary form of the verb is muna (to remember), but it belongs to a special group of irregular verbs. In the present tense, its core vowel changes to "a". It becomes ég man (I remember), hann man (he remembers), and for "you" (singular), it adds an -st ending to make þú manst.

Where is the word for "the" in fundurinn?

In Icelandic, "the" is rarely a separate word before the noun. Instead, it gets attached as a suffix. The base word for "meeting" is fundur. To say "the meeting", we attach the masculine "the" ending -inn to the end, giving us fundurinn.

Does í dag literally mean "today"?

It literally translates to "in day", but it is the standard everyday phrase for "today". You will see this í + [time word] pattern frequently in Icelandic, such as in í kvöld (tonight / this evening).