Question

in your opinion are we can build the time machine in the future and travel by it

Answer 1

Nothing travels faster than the speed of light- so no, we cannot time travel...ever

Answer 2

A wise man once said "The only thing I know for sure is that I don't know anything for sure" :)

"Free" travel doesn't seem to be possible via the laws of physics as they're currently understood, but I've heard interesting arguments (that don't violate causality) that say that it may be eventually feasible to travel forward, but not back.

Answer 3

I hope this will violate some basic laws of physics. this only exists in fiction stories

Answer 4

One of the major conclusions of relativity is that different observers experience time differently, so ^no, not necessarily.