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⇒⇒ Interrogative and negative forms
Se a frase estiver no ''simple present'':
My friend arrives today.
Does my friend arrive today?
My friend doesn't arrive today.
Mas se a frase estiver no ''simple past'':
My friend arrived today.
Did my friend arrive today?
My friend didn't arrive today.
Explicação:
Usamos o auxiliar ''does'' com he - she - it para fazer frases na interrogativa e negativa, no simple present.
does + not = doesn't
Usamos o auxiliar ''did'' para fazer frases na interrogativa e negativa, no simple past
did + not = didn't
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