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The subjunctive mood in French is deployed where a particular utterance indicates a certain attitude or opinion on behalf of the speaker. The subjunctive mood is deployed mostly in situations of doubt or ...

The imperfect tense is used to describe actions that do not have a clear beginning and end. For example, actions that were repeated (‘I used to go to school’), or, what we could call ‘background informati...

When the sheet is pulled down, the volume in the jar increasesThis causes the pressure in the jar to decreaseTherefore, air enters the balloon, down the pressure gradient, causing the inflation.

When simplifying algebraic expressions, we should first factorise each term fully to find any common factors. First we should factorise the numerator where 3x²-8x-3 factorises to (3x+1)(x-3). N...

The primary structure of proteins consist of the sequence of amino acids that are joined by peptide bonds. These amino acids are joined together via a condensation reaction. The secondary structure is for...