He became my teacher.

[Aikuzo]

- He become my teacher.
- He became my teacher.

Help me out on my confusion here guys... xD

"He" is still my teacher right now. That's what I'm trying to say, so should I say "He become my teacher" because 'become' works in the past and still works in the present? OR should I just say "He became my teacher." because he is still my teacher now but 'becoming' can only happen once which is in the past...?
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I quit studying English years ago and have just come back to study the basics.

[Mister Micawber]

'He become' is no good; it is 'he becomes'. 'Become' is a relatively instantaneous action, here in the past. Use 'became'.
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Native English teacher at Mister Micawber's

[Cerberus™]