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In general the preterite is used when something has been completed. If an action has a definite start and end then you should be using the preterite, this can be both if it is something that happened ...
Natural Selection is the accepted theory of evolution first postulated by Charles Darwin and can be thought of as 'survival of the fittest'. It is the process by which a species gradually evolves thro...
The perfect tense is formed from : The auxiliary verb haber + the past participle of the verb , either ending in -ADO(-ar verbs) or -IDO(-er and -ir verbs) He hablado,...
Glycolysis. This is an anaeorbic process whereby glucose is converted to pyruvate via triose phosphate. This process gives out a total of 4 ATP molecules but requires 2 ATP molecules to convert glucos...
An auxiliary verb is the first verb used in a compound tense (when more than one verb is present) such as le passé composé.
Most French verbs take the auxiliary verb avoir - J'ai <...
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