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Which verbs take haben and which take sein in the past tense?

All verbs which indicate movement (or lack thereof) require sein. Everything else requires haben. For example, 'ich bin gegangen,' and 'ich bin geblieben' both refer to movement/lack of movement, which is wh...
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Answered by Chris D. • German tutor
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What is the subjunctive mood?

The subjunctive mood is used to indicate uncertainty, or possibility, in french. For example you would use the subjunctive mood when talking about your feelings, judgments, doubts and opinions, and when orde...
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Answered by Chris D. • French tutor
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What is active transport?

Active transport is the transport of substances against their concentration gradient with the use of energy. Molecules naturally flow down their concentration gradient, ie. from where they are more concentra...
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Answered by Chris D. • Biology tutor
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Solve (x/4)-(2x/x+2) = 1. Give your solutions to 2 decimal places. You must show your working.

We will begin by eliminating fractions in the equation. To do this, the equation will be multiplied by 4 and (x+2), as these are the denominators of the two fractions. Multiplying by 4 gives:x - (8x/x+2) = 4...
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Answered by Dogu Z. • Maths tutor
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Describe how oxygen in the air reaches the capillaries surrounding the alveoli.

As you breathe in, air passes down your trachea and then into the bronchi and bronchioles. The bronchioles divide further into even narrower branches which end in small air filled sacks called alveoli. The a...
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Answered by Naomi A. • Biology tutor
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