Que piensas hacer hoy?
Which is correct ?
Pienso que debo estudiar hoy? would you conjugate deber
or would it be Pienso que deber estudiar hoy?
To answer your question, the correct way to conjugate the verb "deber" in the sentence "Pienso que debo estudiar hoy" would be "debo". This is the present tense conjugation of the verb "deber" in the first person singular (yo).
In Spanish, the verb "deber" means "to have to" or "to must." When conjugating "deber," you take off the -er ending and add the appropriate endings for each subject pronoun. Here is the conjugation of "deber" in the present tense:
- Yo debo (I have to)
- Tú debes (You have to)
- Él/Ella/Usted debe (He/She/You formal have to)
- Nosotros/Nosotras debemos (We have to)
- Vosotros/Vosotras debéis (You all have to)
- Ellos/Ellas/Ustedes deben (They/You all have to)
So in the sentence "Pienso que debo estudiar hoy," you are correctly using the conjugated form of "debo" (I have to) to express the idea of "I think I have to study today."