Tiempos gramaticales

Tabla del verbo To be

Tense	Affirmative	Negative	Interrogative	Example (sentences)
Present continuos	She is talking	She is not talking	Is she talking?	She is talking She is not talking Is she talking?
Present simple	They have a house	They do not have a house	Do they have a house?	They have a house They do not have a house Do they have a house?
Past simple	They wrote a letter	They did not write a letter	Did they wrote a letter?	They wrote a letter They did not write a letter Did they wrote a letter?
Past continuos	It was very cold	It wasn´t very cold	Was it very cold?	It was very cold It wasn´t very cold Was it very cold?
Present perfect	You have read this book	You haven´t read this book	Have you read this book?	You have read this book You haven´t read this book Have you read this book?
Past perfect	She had eaten ice cream	She had not eaten ice cream	Had she eaten ice cream?	She had eaten ice cream She had not eaten ice cream Had she eaten ice cream?
Future	He will go to the gym	He won´t go to the gym	Will he go to the gym?	He will go to the gym He won´t go the gym Will he go to the gym?