vs 

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"Necesito tu ayuda" is a phrase which is often translated as "I need your help", and "por favor" is a phrase which is often translated as "please". Learn more about the difference between "necesito tu ayuda" and "por favor" below.
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
1.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(singular)
a. I need your help
Necesito tu ayuda para sacar la mesa al jardín.I need your help to take the table out into the garden.
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por favor(
pohr
 
fah
-
bohr
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. please
Dame comida, por favor.Give me food, please.
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