Be and become

[sdgsdg]

.I want to become an astronaut
I wonder
Is there a difference if I say
I want to be an astronaut

 

[lingobingo]

You can only be an astronaut after you’ve become one.

 

[sdgsdg]

So I want to be an astronaust is the best choice

 

[lingobingo]

Before you become something, you can use either verb. The point is that becoming something is a single action, and being something is the state that it brings about.

 

[sdgsdg]

Yes, you are correct, and it also works as a linking verb
They became best friends," the word became links the subject (they) with information...
Is that right?

Thanks for your answer I .understand your point of view.

 

[PaulQ]

I want to become an astronaut
I want to be an astronaut

To become indicates a [process of] change - from something to something else: you are now a bus driver, but you want to change into being an astronaut.

The sun shone and the ice became water / As he got older, he became forgetful

To be ignores any change and describes a state -> The ice is now water. He is forgetful.

 

[velisarius]

A small child would normally say "I want to be an astronaut (when I grow up)".

I think "I want to become an astronaut" would require special context. I can imagine a test pilot saying it.