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The pluperfect tense is used to describe an action that happened further back in the past - something you "had done". Here's an example: tu étais partie quand je suis arrivée (you had left when ...

Mucous in the trachea traps pathogens Microorganisms in food are killed by stomach acidThe skin forms a physical barrier against pathogens

An infinitive verb is essentially just the simplest form that a verb can be.It doesn't specify anything to do with who is completing the action; just the action itself.For exampl...

Firstly, pressure is created by air molecules colliding with a surface. At an increased altitude there are fewer air molecules, and therefore a larger average distance between them. This means at this hig...

Passage"Of course, it would be naïve to suggest that all teenagers can be as accomplished as Malala. However, there is, in fact, considerable evidence that the “unfinished” brain can be pretty good a...