Bonjour
1- <em>Tu vas commander </em><u><em>la pizza</em></u><em> ?</em>
<em> </em>Tu vas <u>la</u> commander. <em>(la = fem. sing. --> une pizza)</em>
2- <em>Vous n'allez jamais prendre </em><u><em>l'avion</em></u><em>. </em>
<em> </em>Vous n'allez jamais <u>le</u> prendre. <em>(le = masc. sing. --> un avion)</em>
3- Elle se sent jolie.
<u><em>SE SENTIR</em></u><em> présent (pronominal verb)</em>
<em> </em>je me sens
tu te sens
il/elle/on se sent
nous nous sentons
vous vous sentez
ils/elles se sentent
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<em>Explanation for 1 & 2</em>
<em> the pronoun is always before the verb. BUT, when using the near future, "aller + infinitif" (be going to + infinitive), it is before the infinitive which is the main verb for the meaning of the sentence. "Aller" as "be going to" is only used to form the near future.</em>
<em>EX. :</em>
Tu commandes une pizza. ► Tu <u>la</u> commandes.
Tu <em>vas </em>commander une pizza. ► Tu <em>vas </em><u>la</u> commander.
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hope this helps ☺☺☺