Answer:
The sentences that can be used are:
- <em>Mi amigo </em><u><em>tiene que</em></u><em> madrugar.</em>
- <em>Mi amigo </em><u><em>tiene que</em></u><em> estudiar mucho para el examen de mañana.</em>
- <em>Mi amigo </em><u><em>tiene que</em></u><em> tomar su medicina para la gripe.</em>
- <em>Mi amigo </em><u><em>tiene que</em></u><em> realizar algunos quehaceres en su hogar cuando regrese a casa.</em>
- <em>Mi amigo </em><u><em>tiene que</em></u><em> estar en su casa antes de las 9:00 p.m.</em>
Explanation:
The translation of the sentences is:
- My friend <u>has to</u> get up early.
- My friend <u>has to</u> study hard for tomorrow's exam.
- My friend <u>has to</u> take his flu medicine.
- My friend <u>has to</u> do some chores at home when I return home.
- My friend <u>has to</u> be at home before 9:00 p.m.
The verb <em>"tener que"</em> is regularly <u>used to mention an obligation of a noun</u>, in this case, my friend, for which sentences have been used such as getting up early (which applies if you must go to school), take the flu medicine (so that the symptoms do not worsen) , study for an exam, arrive at your home before a stipulated time and do some household chores to help your parents.
As in all sentences the noun <em>"mi amigo"</em> that belongs to the <u>third person</u> is used, the only possible conjugation of the verb <em>"tener"</em> is <u><em>"tiene."</em></u>