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You are right that 'yo soy' don't both need to be said. If you do say that, you are giving emphasis to the subject pronoun 'I'.
soy = I am
They give 'this is' as a variant to accommodate the English 'This is John', when spoken by John.
'This is John' = 'Soy John' = 'I am John'
The English word 'present' is a formal response given by a student during roll call. It looks like they are suggesting that 'soy' is the Spanish equivalent.. Saying 'Presente' would be too formal a response, so pupils answer 'Sí, soy yo' (like saying 'Here' in English). They often shorten that response to just 'Sí'.
Last edited by Rusty; January 22, 2017 at 01:35 PM.
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