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Dear teachers,
Could you please help me use" half " correctly?
Can I say:

This work takes one/a year and a half to finish.
This work takes one/a and a half year to finish.

Thank you in advance
Comments 
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This work took / will take one/a year and a half to finish.
This work took / will take one and a half years to finish.
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Thank you Mister Micawber very much