Learn Arabic (Modern Standard): إذا أكدت الحضور، فسنكمل التسجيل في نفس اليوم. - If you confirm the attendance, we will complete the registration on the same day.

After the conditional particle إذا (if), Arabic strictly uses the past tense for the condition clause, even though the meaning refers to the future. It logically frames the condition as a completed fact: 'If you have confirmed, then we will...'.

Why is the prefix فـ attached to the result clause in فسنكمل?

The prefix فـ (fa-) is mandatory here to introduce the result of the condition. Whenever a result clause after إذا begins with a future marker like سـ (sa-) or سوف (sawfa), you must attach فـ to connect it back to the 'if' statement.

Could I use لو (law) instead of إذا for 'if' in this sentence?

No, because لو is used for hypothetical or contrary-to-fact situations (meaning 'If you had confirmed, but you did not'). Because this sentence describes a real, possible future event, you must use إذا or إن (in).

How does the phrase نفس اليوم mean 'the same day' when adjectives usually follow the noun in Arabic?

To mean 'the same', the word نفس acts as the first part of an Idafa (genitive construction) and sits right before a definite noun. If you put it after the noun with a pronoun suffix (like اليوم نفسه), it changes the meaning to 'the day itself' for emphasis.