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Writing: Shift in verb, tense, and mood — Harder example

Video transcript
hello test takers it's david runs from from the grammar section hanging out here with dave travis from sa t hi so we're going to go through the sentence and try to help you figure out which one which of the answers is correct and which are wrong sounds good ever since Alice discovered the secret elevator she uses it to travel between the first and second floors and to avoid crowds in the hallway now which of these options do we want to look at so number one so a no change she uses it to travel between the first and second floors option B she has used it option C she should use it an option d she will have used it so this is complicated right because we're setting up this scenario with this dependent clause ever since Alice discovered the secret elevator this is not a sentence on its own and this gives this gives the rest of the sentence a context so this is setting up like a time boundary that we're operating within so this is something that has been going on since Alice discovered the secret elevator great and the one thing you could do is you could basically look at Alice discovered the secret elevating you say ever since Alice something ever since she did something she uses it ever since she turned 16 she has been able to drive ever since she got a dog she has had to wake up half hour earlier so what's confusing about this is that even though this part of the dependent clause takes place in the past tense we're using ever since to bring ourselves into the present ever since thing x happened thing why now happens in the present tense so it's weird because you'd think that you'd want to just say uses ever since Alice discovered the secret elevator she uses it but we're talking about something that has been completed and has been done for a while aha so here we have this has used that's the tents that we're talking about when we say since I turned 18 I have been able to ever since she turned 18 she has been able to vote so this ever since leads us to has now if we want to cross out these other two ever since this happened I should that doesn't sound right ever since something happened I will have definitely not right so here we have ever since Alice discovered the secret elevator she has used it to travel between the first and second floors and to avoid crowds in the hallway