Escribe la forma correcta de "to be". Utiliza la forma sin contracción.
Ejemplo We ____ in the park.1 de 10 David ____ happy. (negative)3 de 10 ____ you Spanish?4 de 10 My brother and I ____ at home. (negative)5 de 10 Peter and Mark ____ brothers.6 de 10 The cat ____ on the table.7 de 10 It ____ a very nice day.8 de 10 I ____ 13, I am 14. (negative)9 de 10 It ____ 8 o'clock.10 de 10 We ____ good friends. 
