Correct the sentences by adding a, an, or the.
a I need /new mouse for my computer,
b Why are you always in good
mood?
Red, yellow and blue are three primary colours.
d Photoshop is program for editing digital images.
e Acid rain is big problem in parts of Europe.
We went out for meal last night at Indian restaurant in South Street,
9 My brother became engineer because he liked playing with motors.
h I lost all my work when computer crashed.
This is book she gave me.
j It takes one hour to finish unit of this book.
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Present PerfectShe has written an e-mail 
Has she written an e-mail?
What has she written?
Has she written an e-mail or letter?
She has written an e-mail, hasn't she?
Past Perfect
They had eaten all food before he came.
Had they eaten all food before he came?
What had they done?
Had they eaten all food or drunk everything before he came?
They had eaten all food before he came, hadn't they?
Future Perfect
I will have read a book by 4 tomorrow
Will I have read a book by 4 tomorrow?
What will I have done by 4 tomorrow?
Will I have read a book by 4 or by 6  tomorrow?
I will have read a book by 4 tomorrow, won't I?

Present PerfectShe has written an e-mail 
Has she written an e-mail?
What has she written?
Has she written an e-mail or letter?
She has written an e-mail, hasn't she?
Past Perfect
They had eaten all food before he came.
Had they eaten all food before he came?
What had they done?
Had they eaten all food or drunk everything before he came?
They had eaten all food before he came, hadn't they?
Future Perfect
I will have read a book by 4 tomorrow
Will I have read a book by 4 tomorrow?
What will I have done by 4 tomorrow?
Will I have read a book by 4 or by 6  tomorrow?
I will have read a book by 4 tomorrow, won't I?