Conjugación de los 12 tiempos verbales del inglés y el verbo To Be
PAST                                       PRESENT                                       FUTURE
              Acción que ya pasó                            Acciones rutinarias o cotidianas             Acciones que sucederán
                       Ella escribió una carta                        Ella escribe una carta                      Ella escribirá una carta
                      (+) S + V pasado + Com                            (+) S + V (S) + Com                        (+) S + will + V + Com
                           She wrote a letter                            She writeS a letter                        She will write a letter
  SIMPLE
                  (-) S + Did not + V present + Com           (-) S + Do/does not + V present + Com      (-) S + will not/won't + V present + Com
                        She didn't write a letter                     She doesn't write a letter                   She won't write a letter
                  (?) Did + S + V present + Com + ?           (?) Do/Does + S + V present + Com + ?         (?) Will + S + V present + Com + ?
                        Did she write a letter?                       Does she write a letter?                     Will she write a letter?
              Acción que estaba pasando                     Acciones que están pasando ahora             Acciones que estarán sucediendo futuro
                  Ella estaba escribiendo una carta              Ella está escribiendo una carta             Ella estará escribiendo una carta
                  (+) S + ToBe past + V ing + Com              (+) S + ToBe present + V ing + Com              (+) S + Will Be + V ing + Com
                       She was writing a letter                        She is writing a letter                   She will be writing a letter
CONTINUOUS
                (-) S + ToBe past(not) + V ing + Com         (-) S + ToBe present(not) + V ing + Com        (-) S + Will Be (not) + V ing + Com
                      She wasn't writing a letter                     She isn't writing a letter                She won't be writing a letter
                (?) ToBe past + S + V ing + Com + ?           (?) ToBe present + S + V ing + Com + ?        (?) Will + S + Be + V ing + Com + ?
                       Was she writing a letter?                       Is she writing a letter?                  Will she be writing a letter?
              Acción que había ocurrido antes de otra       Acción que ha ocurrido y puede repetirse     Acción que habrá ocurrido para una fecha
                    Ella había escrito una carta                    Ella ha escrito una carta             futura Ella habrá escrito una carta
                 (+) S + Had + Vpast participle + C           (+) S + Have/has + Vpast participle + C     (+) S + Will have + Vpast participle + C
                        She had written a letter                      She has written a letter                  She will have written a letter
 PERFECT
                  (-) S + Had(not)+ Vpast part + C            (-) S + Have/has(not)+ Vpast part + C        (-) S + Will have(not)+ Vpast part + C
                      She hadn't written a letter                    She hasn't written a letter               She won't have written a letter
                (?) Had + S + Vpast participle + C +?       (?) Have/has + S + Vpast participle + C +?    (?) Will + S + Have + Vpast part + C +?
                       Had she written a letter?                      Has she written a letter?                 Will she have written a letter?
              Acción que había estado ocurriendo            Acción que ha estado ocurriendo      Ella    Acción que habrá estado ocurriendo
               Ella había estado escribiendo una carta           ha estado escribiendo una carta         Ella habrá estado escribiendo una carta
                  (+) S + Had been + V ing + Com               (+) S + Have/has been + V ing + Com         (+) S + Will have Been + V ing + Com
 PERFECT             She had been writing a letter                  She has been writing a letter            She will have been writing a letter
CONTINUOUS      (+) S + Had been (not)+ V ing + Com         (+) S + Have/has been (not)+ V ing + Com     (+) S + will have Been (not)+ V ing + Com
                    She hadn't been writing a letter               She hasn't been writing a letter          She won't have been writing a letter
                (+) Had + S + been + Ving + Com + ?         (+) Have/has + S + been + Ving + Com + ?     (+) Will + S + have been + Ving + Com + ?
                    Had she been writing a letter?                 Has she been writing a letter?            Will she have been writing a letter?
                              PAST                                         PRESENT
                  I was at home / Estaba en casa                  I am at home / Estoy en casa
 Verb to Be
               I wasn't at home / No estuve en casa           I am not at home / No estoy en casa
              Were you at home? / Estabas en casa?              Are you at home? / Estás en casa
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