no estar seguro de

A transitive verb phrase is a phrase that combines a verb with a preposition or other particle and requires a direct object (e.g., take out the trash.).
transitive verb phrase
a. not to be sure of
Ángel no está seguro de haber aprobado el examen. No le fue bien.Angel isn't sure of having passed the exam. It didn't go well.
b. not to be sure about
Me gusta esa camisa, aunque no estoy seguro del color.I like that shirt, although I'm not sure about the color.
c. not to be sure
Andrés no está seguro de a qué hora empieza la película, pero cree que sobre las seis.Andres isn't sure what time the movie starts, but he thinks it'll be around six.
d. not to be certain as to
Cuando dice cosas como esa, no estoy seguro de si me cae bien o no.When he says things like that, I'm not certain as to whether I like him or not
e. not to be certain about
No estoy seguro de la edad de Isabel, pero creo que es mayor que yo.I'm not certain about Isabel's age, but I think she's older than I am.
f. not to be certain
No estoy seguro de si votarle o no en las elecciones.I'm not certain whether to vote for him or not at the election.
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