## How will this happen ##

This could be translated as "How is this possible?" Though Mary did not understand how it could happen, she did not doubt that it would happen.

## will come over you ##

This phrase and the next one are ways of saying that the Holy Spirit would supernaturally cause Mary to become pregnant even while she still remained a virgin. Make sure it is clear that there was no physical union involved; this was a miracle.

## The power of ##

This could be translated as "By his power."

## will overshadow you ##

This could be translated as "will cover you like a shadow" or "will be with you" or, "will cause this to happen." Again, make sure this does not imply any physical union.

## the holy one ##

"the holy child" or "the holy baby"

## will be called ##

This could be translated as "people will call him" or "people will acknowledge that he is."