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What is the difference between the perfect and imperfect tense?

The perfect tense is use to express actions which heve certainly been completed. In some cases it is used because it only happened once.For instance "J'ai passé mes vacances scolaires à Lyon avec ma fam...
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Answered by Victoria M. • French tutor
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When do you use the subjunctive?

You can remember when to use the subjunctive using the acroynm WEIRDO: W ishes, hopes and desires e.g. quiero que, espero que, deseo que E motion e.g. me gusta que, me soprende que, tengo miedo de que I mper...
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Answered by Munroop P. • Spanish tutor
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What is Evolution?

The Theory of Evolution states that organisms change (evolve) over a long time (from simple life forms) due to natural selection. Natural Selection: this is based on 3 key points. 1: that there is a lot of d...
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Answered by Dominic Y. • Biology tutor
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Proton NMR Made Easier

Proton or 1 H NMR can look complicated but with practice; there are techniques that can make the peak assignment a little easier.1. Make sure you count the proton environments correctly, if the molecule disp...
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Answered by Martin L. • Chemistry tutor
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What is a stationary point on a curve? How do I calculate the co-ordinates of a stationary point?

A stationary point simply means a point in a curve where the gradient is equal to 0.For example, in the June 2015 C3 Paper it is asked:Find the exact values of the coordinates of the stationary points of the...
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Answered by Martin L. • Maths tutor
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