Hello DS
I said " it is confused me a bit ", now you correct me "It has confused me " and it confused me a bit"
Now I want to know where It suppose to use verb "to be",where I suppose to use verb "to have".
So it's wrong to say " I am confused" ?, the correct is "I have confused" !! ,If yes, WHY, and how I can know which one should be used (have/be) ?
The present perfect (has for the singular and have for the plural + past participle) is used to express an action or event that is still going on or has only just stopped. For example, let's say that you were making a post right now. When you are done, you can use the present perfect tense to express that you are done by saying, "I have just made a post."
In the case of the verb confuse, you don't need to use verb to be at all in the way you have used it in your posts—that is, "it is confused"; that basically says that the pronoun it, whatever it is referring to, is the subject of the verb is, meaning that it is the confused entity.
"I'm confused" is perfectly correct to say that you are currently confused. "I have confused" is incorrect as an expression of the fact that you are confused; have requires the past participle of verb to be to function as an expression of an ongoing state of being, such as confusion. "I have confused" by itself uses the transitive meaning of the verb confuse, meaning that you have confused someone. So, for example, if you tell someone a riddle and they keep thinking about it without being able to solve it, you have confused him or her.
Here are a couple of examples for illustration:
1) Godobeyer is talking to Richard Dawkins about the Islamic concept of God, and Richard Dawkins doesn't understand it well. Therefore, Richard Dawkins is confused; the Islamic concept of God (the subject) has confused him (the object). Richard Dawkins, in his state of confusion, says, "I am confused. This conversation confuses me."
Then, seeking to understand the Islamic concept of God after failing to understand it from his discussion with Godobeyer, Richard Dawkins asks Abdullah about it. Dawkins says, "Abdullah, I'm trying to understand your religion's concept of God; it has confused me; I have been confused about it for a while [which is why Mr. Dawkins used the present perfect to express his confusion]."
2) Dawkins, failing to understand the Islamic concept of God yet again, says, "This is confusing [here, confusing is an adjective, meaning "causing or resulting in confusion."]." He has been confused for a long time because it has confused him, he is still confused right now because it is confusing him, and he finds it confusing.
I hope this helps; hopefully it is not confusing to you.
(Feel free to ask if you have any questions about the above or anything else. )