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The imperfect tense is used for ongoing actions (e.g. was doing) or actions done regularly in the past (e.g. used to do). It is formed by taking the endings off a verb to form its "stem". For -a...

Alpha radiation isn't very penetrating and so is absorbed and stopped by smoke particles. This causes a change in count rate when there is smoke present. This change in count rate allows the alarm to be t...

In order to prove this we can write a general expression of an odd number in terms of n, e.g - 2n+1Square this 'odd number': (2n+1)^2, therefore you can write it as (2n+1)(2n+1), then expand (multiply out...

Thick, waxy cuticle - stops evaporation from the leavesStomata that are able to open and close through changes in guard cell turgor pressure- stops water loss by transpiration at night or when water avail...

In general, we use imparfait to talk about our memories from the past. Imparfait indicates actions that were continuous, not momentary. For example: "Quand j'avais les boucles d'oreilles, j'aimais le...