One uses hace + expression of time + a verb in the present tense to indicate an action which began in past time and continues in the present time.
The hace clause may be used either before or after the main verb; if used afterwards, desde is inserted before hace.
Let's look at some some slightly different ways to use the verbhace to discuss the passage of time.
Preterite Tense
The same construction is used to indicate an action which began and ended at an earlier time.
Imperfect Tense
The same construction, but using the imperfect hacía + expression of time + a verb in the imperfect tense is used to indicate an action which is continuing on in past time but which started at an earlier time.
Hacía una hora que estudiaban.
They had been studying for an hour.
They had been studying for an hour.
¿Hacia cuánto tiempo que trabajaba usted?
How long had you been working?
How long had you been working?
As before, hacía may be used either before or after the main verb; if used afterwards, desde is inserted before hacía.
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