"Since I have known her, she has never come here."
Translation:Depuis que je la connais, elle n'est jamais venue ici.
"Depuis" in French is used with the present tense to indicate an action that started in the past and is still happening in the present. In English, you would focus on the past (since I have known her), but in French, the focus is on the present because the action is still happening in the present.
If you have some time, read this explanation about "depuis":
"Depuis" is a preposition, and "depuis que" is the conjunction. In other words, you need the conjunction if you need "since" + subject and verb. This pattern is true for many other prepositions and conjunctions: après, après que, avant, avant que, pendant, pendant que, etc.
- depuis 2001 = since 2001
- depuis que je la connais = since I have known her
- avant mai = before May
- avant que ma mère revienne = before my mother comes back
it is used with the negation " ne " or " sans " if the verb is bound with ( I do not know how to translate the verb " lier " in english )
I give you some examples
je n'ai jamais connu
ils n'ont jamais connu
nous avons jamais connu
with the negation " sans "
je travaille sans jamais douter
ils travaillent sans jamais douter
but also without negation if it is not used with the verb
je l'ai toujours connu comme cela, jamais fatigué, jamais sans se plaindre !
but also in a positive way
as tu jamais douté
avez vous jamais douté