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When should I use the preterite and the imperfect form of the past tense?

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 once or...
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Answered by Nicky F. • Spanish tutor
4360 Views

What is Natural Selection?

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 through tim...
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Answered by Ellie W. • Biology tutor
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How is the perfect tense formed?

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, He comido, He vivido. Example : COMER H...
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Answered by Rachelle O. • Spanish tutor
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How do I know when to use être or avoir as an auxiliary verb?

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 regardé la télé . However, ...
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Answered by Charlotte S. • French tutor
9655 Views

How does the structure of the red blood cell allow it to carry out its functions?

The main function of the red blood cell is transport oxygen around the body to other cells. It contains haemaglobin which allows the binding of oxygen. Its biconcave shape maximises the surface area to incre...
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Answered by Narumi I. • Biology tutor
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