Now that you saw it, it belongs to you now.建议如上,因为别人一定是说话之前看到,应该用过去式。就属于你了,是现在该物品属于人家了,不应该用将来时。
Now that既然,后跟完成时 so正解应该是Now that you have seen , that will belong to you
Now that you see, that belongs to you
Since You ve Seen it Its Yours Now