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The genus of a leech is Haemopis.
leech = βδέλλα bdella leech= βδέλλα bdella
To answer this question would take a lot of writing. The best thing for you to do is get hold of an English grammar book and read about will and would. Something like:
'An A-Z of English Grammar and Usage' by Geoffrey Leech.
Leech is 6' 3".
A leech is a fasinating parasite