The word "his" here is the plural possessive. So, it refers to a particular person, it belongs to him: "his". This person has several and it belongs to him.
And the "eyes" are the part of the body that we use to see, to look. We have two eyes, a right eye, a left eye. Between the two, there is the nose. These are the organs that we use to see, for sight.
There is no clear origin for this expression "not to believe one's eyes", but it is very figurative, we can easily understand it. You have to imagine, when we use this expression "not to believe one's eyes", that you see something that is so surprising that it is as if your eyes are mistaken, as if you cannot trust what you see, as if your eyes are necessarily mistaken. What you see is too surprising. You imagine this image a little, eh.
So, you can easily understand that "not believing your eyes" is used to show that you are very surprised by something you see. You are stunned, you cannot imagine this thing, you cannot believe that what is happening is real.
We change the possessive depending on iran whatsapp number data the subject. I would say "I can't believe my eyes", I can also say "you can't believe your eyes". We change the possessive depending on the subject. But you get the idea here, right? We don't trust our eyes, we don't believe what our eyes show us because we are extremely surprised, we are stunned.
As usual, we will look at a few examples. The first is someone who tells you: "The show this weekend was magnificent. I couldn't believe my eyes." Here, we understand that this person was amazed, very surprised by what she saw. It was so beautiful or so exceptional, so great, that she had trouble understanding that it was real.
Now imagine, you have a couple who are organizing, who have ordered work in their house. And then, when they leave work, the man says to the woman: "The work at our house has progressed enormously. You won't believe your eyes." In saying this, he tells her: "You're going to be very surprised, you're going to be amazed. It's terrible or it's at least terrible in a good way here, in a positive way. There has been a lot of progress, a lot of progress, you're going to be very surprised."
Another small example, in the workplace this time, someone says: "He was so angry that he left the meeting without saying anything. We couldn't believe our eyes." Here, you had the other participants in this meeting who were stunned, very surprised to see that this person had left the meeting. Everyone was extremely surprised. They couldn't believe their eyes.
So you see, I didn't lie to you, this expression is relatively clear to understand because it is very figurative. And now that you have grasped it, I suggest you practice your pronunciation a little by reinforcing it a little, by making this expression your own again. As usual, you don't focus on grammar, on conjugation, you focus on repetition. The rest will come by itself. So, here we go. You repeat after me.