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1- What is the subjunctive? 

It is a mood (not a tense!) which expresses uncertain ideas.

2- So when do I use it? 

Set phrases with 'que' 

Negati...

This is a typical gradient question for A2 papers, as it requires use of the Product Rule and Chain Rule, as well as knowledge of e^x.

Firstly, we can see that we will need to use the Pro...

The ‘passato prossimo’ tense is the ‘near past’ and the most frequently used past tense in the Italian language, especially used in conversation.

The passato prossimo is formed with the a...

Every Spanish noun is either feminine or masculine and follows an article of the same gender.

Masculine articles

​El / Un (masculine singular artic...

A pendulum bob will move fastest when the mass is at its lowest point (when x=0). The reason for this is that in the pendulum system energy is transferred between kinetic and gravitational potential en...