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"Desde hace" is used when talking about an interval of time, a duration, i;e: "Estoy enferma desde hace une semana." ("I have been sick for a week").

"Desde"...

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(1/2)x(5/8)=5/16

100/16=6.25

6.25 x 5 = 31.25

The imperfect tense is used for an ongoing action, meaning that the action has started but it hasn't finished yet. It is lasting in time, for example: "Je tenais dans mes mains une assiette." (&...

An operating system is a system software found within a computer system which ensures that the computer peripherals and softwares installed onto the system are functioning properly. The o...