<b>1. It will be built in 2020</b><br/><br/><b>2. It will be built by 2020</b><br/><br/>Is the meaning here the construction of the building will be finished sometime in 2020?<br/><br/><b>3. It will be built in August</b><br/><br/><b>4. It will be built on August 20</b><br/><br/>3 means the contruction of the building will be finished in August<br/><br/>4 means the construction of the building will be finished on August 20.<br/><br/><b>5. It will be built from August 20</b><br/><br/>5 means the contruction of the building will be finished sometime after August 20.<br/><br/>Ok? Thanks Fulvio