3- Marque a alternativa correta:  a) I _______ at school last night.                  (    ) was    (    ) were    (    ) am   b) It ______  cold here.                                  (    ) was    (    ) were    (    ) am   c) _______  you at home last night?              (    ) was    (    ) were    (    ) did   d) She _______  at school last Monday.  (    ) wasn´t    (    ) weren´t    (    ) didn´t   e) They __________ classmates at school.    (    ) was    (    ) were    (    ) am   f) _______ your mother at home yesterday?   (    ) was    (    ) were    (    ) am   ​