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For instruments that use a lower register, using the bass clef would sometimes mean lots of ledger lines, which can make a piece of music hard to read.  So, the alto and tenor clefs are used.  The only...

White blood cells in the body can attack pathogens, which are micro-organisms which cause disease. 

The white blood cells can ingest the pathogen, produc...

To form a conditional clause you need to start with the word 'si' - if, then make sure that you are using the right tenses for the rest of the sentence!

1. Si + present + future (e.g. si ...

The words 'encantar' - to love, 'faltar' - to be lacking something, 'interesar' - to be interesting to, 'aburrir' - to bore, 'fascinar' - to be fascinating to, 'bastar' - to be sufficient to, 'molestar...

When we conjugate a radical changing verb, both the stem and the ending change, as opposed to just the ending changing as it does for 'normal' verbs.

The...