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In english 'ser' and 'estar' are both translated as 'to be', but are used differently. 'Ser' is used when when it's a permanent reality, for scenarios that are always true and don't depend on any circumst...

The wave of excitation originates in the sinoatrial node in the right atrium. From there, it travels through the right and left atria, causing contraction of the atria (atrial systole). It is prevented fr...

'quello' is a masculine name used to indicate something far'quella' has the same use but it is used for feminine nouns

(x + 1)/((x^2)*(2x – 1)) = -3/x - 1/x^2 + 6/(2x-1)

The imperfect subjunctive is a tense used in the same contexts that you would use the indicative (or present) subjunctive, yet referring to something in the past.
You compose a phrase using the impe...