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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 ...
You can remember when to use the subjunctive using the acroynm WEIRDO:
Wishes, hopes and desires e.g. quiero que, espero que, deseo que
Em...
The Theory of Evolution states that organisms change (evolve) over a long time (from simple life forms) due to natural selection.
Natural Selecti...
Proton or 1H 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 ...
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 ...
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