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You can remember which verbs use être rather than avoir by learning this pneumonic:DR + MRS VANDERTRAMP
DevenirRevenir
MontrerRentrerSortir
VenirArriverNaïtreDescendreEntrerRetournerTomberR...

The Imperfect tense is primarily used for explaining actions that happened regularly in the past or for explaining characteristics and states of things in the past. For example, you would say 'había mucho...

The subjunctive is a mood, not a tense. The other ‘moods’ would be the indicative and the imperative. The subjunctive also exists in English (“If I were rich, I would…”) but it is much more common in Span...

First rewrite right hand side in terms of sinθ and cosθ, because those are the terms we'll be dealing with on the left hand side: sec2θ+tan2θ = 1/cos2θ + sin2θ/cos2θ, so RHS = (1+sin2θ)/cos2θNow look at t...

x = −b ± √(b² − 4ac) / 2a
x = −20 ± √(20² − 4(3)(-500)) / 2(3)
x = (3x + 50) (x - 10)