Note: The verb can be positive (+) or negative (-). Use not to form the negative.
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Example: My teacher (be) is nice. (+)
Example: The cat (be, not) is not hungry. (-)
1-
 The old man (be) ________ wise. 2-The sun (be) ________ hot. 3- The 
children (be) ________ eating bananas. They (be, not) ____ ____ eating 
apples. 4- I (be) ________ happy. I (be, not) ____ ____ sad. 5- The race
 car (be) ________ fast. It (be, not) ____ ____ slow. 6- My friend (be) 
________ buying a new car. Her old car broke down. It doesn't work 
anymore. 7- I (be) ________ at the beach with my family. It (be) 
________ hot and sunny outside. The ocean water (be) ________ warm. 8- 
Kory and Jacob (be) ________ very smart. Kory (be) ________ a scientist 
and Jacob (be) ________ an engineer. 9-The library (be) ________ open 
until 9:00 p.m. 10- The school (be) ________ small. It (be, not) ____ 
____ big.  The books (be)  ________ new.
 Take a test here:
http://www.ego4u.com/en/cram-up/tests/simple-present-1