Verb to be - present + past + future

O verbo to be significa "ser" e " estar". O verbo to be varia de pessoa para pessoa no presente e no passado, mas é uma exceção. As pessoas (pronomes pessoais) em inglês são, no singular: I, you, he, she, it (eu, você, ele, ela, ele/ela para o que não é pessoa). No plural: we, you, they (nós, vocês, eles/elas). 

PRONOME PESSOAL	PRESENTE	PASSADO
1ª pessoa do singular – I	I am	I was
2ª pessoa do singular – you	you are	you were
3ª pessoa do singular – he, she ou it	he/she/it is	he/she/it was
1ª pessoa do plural – you	you are	you were
2ª pessoa do plural – we	we are	we were
3ª pessoa do plural – they	they are	they were

Quando se fala de maneira informal, o verbo to be pode ser contraído (assim como fazemos quando usamos tá ao invés de está, por exemplo):
I am > I’m
you are > you’re
he is > he’s
she is > she’s
it is > it’s
we are > we’re
they are > they’re

Na negativa, podemos só acrescentar not ou contrair:
are not = aren’t
is not = isn’t
were not = weren’t
was not = wasn’t

Para conjugação no futuro usamos: "will be" (afirmativo) e "won't be" (negativo). Perguntas usamos Will - sujeito - be, ex: Will she be here tomorrow? (Ela estará aqui amanhã?). E é usado para todos os pronomes (I-he-she-it-you-we-they). 

Fonte: http://englishlive.ef.com/pt-br/blog/ingles-basico-o-famoso-verbo-to-be/

Vamos praticar. Responda com respostas afirmativas e negativas.

1. Are you fat?

2. Are you skinny?                   

3. Are you beautiful?               

4. Are you ugly?                      

5. Are you intelligent?             

6. Are you dumb?                    

7. Are you old?                        

8. Are you young?                   

9. Are you optimistic?            

10. Are you pessimistic?           

11. Are you cold?                      

12. Are you hot?                      

13. Are you tall?

14. Are you short?

15. Are you sick?

16. Are you tired?

17. Are you calm?

18. Are you anxious?

19. Are you bored?

20. Are you happy?

21 Are you sad?

22. Are you stressed?

23. Are you nervous?

24. Are you religious?

25. Are you accessible?

26. Are you aggressive?

27. Are you ambitious?

28. Are you conceited?

29. Are you generous?

30. Are you tacky?

31. Are you vengeful?

32. Are you communicative?

33. Are you courageous?

34. Are you addicted to chocolate?

1. Were you at home yesterday at 4 pm?

2. Were you at work yesterday at 5 pm?

3. Were you at school yesterday at 3 pm?

4. Were you at the bank yesterday at 2 pm?

5. Were you at the mall yesterday at 1pm?

6. Were you (at/on) the beach yesterday in the afternoon?

7. Were you sick yesterday?

8. Were you tired yesterday at 6 pm?

9. Were you calm yesterday?

10. Were you anxious yesterday?

11. Were you bored yesterday?

12. Were you happy yesterday?

13. Were you sad yesterday?

14. Were you stressed yesterday?

15. Were you in Florianópolis yesterday?

16. Were you in Rio de Janeiro yesterday?

17. Were you downtown yesterday?

18. Were you nervous yesterday?

1. Will you be at home tomorrow morning?

2. Will you be at work tomorrow night?

3. Will you be at school next week?

3. Will you be at the bank on sunday?

4. Will you be at the mall on saturday?

5. Will you be (at/on) the beach on tuesday?

6. Will you be in Rio de Janeiro next holiday?

7. Will you be downtown next friday?

J Pesquise, investigue, seja independente e autônomo. Seja você o maior responsável pelo processo de ensino-aprendizagem. J

Fontes: Express Grammar of English, The Richmond, Amos-Prescher.

                    The Grammar book, Oxford, Swan & Walter.

           English Grammar in use, Cambridge, Raymond Murphy.