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How can I tell when to use 'ser' or 'estar'?

These two verbs are often confusing for students of Spanish as the split of 'to be' into two verbs is not seen in English. Therefore, it's important to have a quick method to accurately decide which verb ...

GA
Answered by Gregor A. Spanish tutor
1832 Views

Write √5 ( √8 + √18 ) in the form a√10, where a is an integer, without using a calculator.

We start by expanding the brackets : (√5 x √8) + (√5 x √18). A common mistake here is to attempt to add √8 and √18 together. We can't do this because of algebra rules. BIDMAS states that multiplicatio...

AJ
Answered by Adrienn J. Maths tutor
9377 Views

Describe the bonding in, and the structure of, sodium chloride and ice. Explain why they have very different melting points.

(Firstly, we identify this as a ‘Structure and Bonding’ problem and try to distinguish between the bonds holding atoms together and the intermolecular forces holding molecules together. We can take ea...

GK
Answered by Georgia K. Chemistry tutor
18240 Views

When should I use the subjunctive?

The subjunctive isn't a tense (like the present, past or conditional), it's a mood used to express thoughts, possibility or necessity. The subjunctive is triggered by certain verb structures that you will...

IT
Answered by ISABELLE T. French tutor
1466 Views

Explain how pressure differences in the heart ensure sufficient pumping of blood into the arteries. (3)

increased pressure in the ventricles the pressure in the ventricles is higher than the pressure in the atria causing the atrioventricular valves to closecausing the semilunar valves to open and the blood ...

KW
Answered by Kelly W. Biology tutor
3411 Views

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