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There is a set number of verbes which use "être" as their auxiliary verb. These verbes are also called verbes de la gare. They are associated with movements of people and you can use them when i...

DOPAMINE = Responsible for motivation/reward. Important in addictive behaviour. Dopamine is released when doing a rewarding behaviour. Drugs increase dopamine levels. Can be environmental → seeing a pack ...

As a general rule think about ser being a permanent description and estar being temporary.

For example, to say someone is tall, use ser and you if you are saying that they look tall today you would...

As a general rule, the preterite is used when there is a finite beginning and end. If there is any ambiguity then use the imperfect. There are also specific rules for each tense.

If you are descr...

The ways to differentiate a function depend on the function itself. If there is only one x value in the function you can differentiate as normal (hard to explain on a computer), yet if the function contai...