vcolts Q: 1. Are they grammatically correct? Yes.
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vcoltsQ: 1. Are they grammatically correct?Yes.
vcolts2. They can mean the same thing, right?Not really: 'will' does not mean 'need to'. Regarding after vs in, the second is the native choice.
vcoltsAfter three hours, I will need to move to another building. Is the above the same thing as "In three hours, I need to move to another building"?Yes, but the 2nd is the native choice.
vcoltsDo I need "will" in that sentence? If not, is there a difference between having "will" and not having "will"?I have already said that they are synonymous.