"If not" is a phrase which is often translated as "si no", and "or else" is a phrase which is also often translated as "si no". Learn more about the difference between "if not" and "or else" below.
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A phrase is a group of words commonly used together (e.g once upon a time).
a. si no
You need to pay us, or else we can no longer do business with you.Necesitas pagarnos; si no, ya no podemos hacer negocios contigo.
b. de lo contrario
You need to ask questions when you have them, or else I won't be able to help you.Necesitan hacer preguntas cuando las tengan; de lo contrario no podré ayudarles.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).