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Li sostituiremo domani.

Li sostituiremo domani.
We will replace them tomorrow.
From Lesson 170:Any and whatever (qualsiasi, qualunque)·Italian

Questions & Answers about Li sostituiremo domani.

Why is the pronoun Li used here instead of Loro?
Li is the direct object pronoun for "them" (referring to masculine or mixed-gender groups), meaning it receives the action directly. It always goes before the conjugated verb. Loro is used for indirect objects (meaning "to them") or after a preposition. Since we are directly replacing the items, li is the correct choice.
What is the infinitive of sostituiremo and how is its future tense formed?
The infinitive is sostituire (to replace or substitute). To make the "we" (noi) form in the future tense for an -ire verb, you drop the final -e from the infinitive and add the future ending -emo, giving us sostituiremo.
I remember sostituire uses the -isc- pattern in the present tense. Why doesn't it appear here?
The -isc- insertion (as in io sostituisco) only applies to the present tense (indicative, subjunctive, and imperative). The future tense is built purely from the infinitive root, so the -isc- pattern disappears entirely.
If we were replacing feminine objects, how would the sentence change?
If "them" referred entirely to feminine nouns (like le batterie, the batteries), you would change the masculine plural pronoun li to the feminine plural pronoun le, making the sentence: Le sostituiremo domani.

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