The Difference Between "Be" and "Become"

Be and become are similar word, so both words are considered have similarities. However, we should note that these word has different use.
Be is used for present tense, and become is used for future tense in sentence. For example:
# I want to be a waitress today.
# I will become an English teacher in Japan.
However, both are correct, if used for informational purposes.
Keyword:
be vs become, grammar