Answer/Explanation:
"Mi abuelo fue profesor de matemáticas por cincuenta años."
can be translated to
"My grandfather was a mathematics teacher for fifty years. "
As I saw on the comments, you said the options are:
ser-yo
ser tu
ser-el/ell/ud
ser-nosostros
ser-urds./ellos
ir-yo
ir-tu
ir-el/ella/ud/
ir-nosostros
ir-uds,/ellos
Answer:
The correct answer is ser-el/ell/ud .
Explanation:
The verb ser (to be) in this case is conjugated in the past tense, where it becomes FUE.
The verb Fue (was) indicates something that a person was in a certain period of time in the past, in this case for 50 years.
Now, we have pronouns that accompany this verb, and the one that corresponds to "my grandfather" is the pronoun él.
Given this information, the correct answer is ser-el/ell/ud .
