The verb "be" refers to a continous state. The verb "become" implies a transition from one state to another. I want to be a doctor.
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anupam771.I want to be a doctor. 2.I want to become a doctor.Both sentences above are correct. Use 1. if you want to put emphasis on the final result (being a doctor) and use 2. if you want to focus on the process of achieving the final result.