Reflexive pron

Fórmula
Afirmativa	sujeto + verbo (Pasado)	You studied English.
Negativa	sujeto + did + not + verbo (infinitivo)	You did not study English.
Interrogativa	did + sujeto + verbo (infinitivo) ?	Did you study English?
Interrogativa Negativa	Did + sujeto + not + verbo (infinitivo) ?	Did you not study English?