Choose or chose

Lately I have been seeing people using the word 'chose'
when they mean ' choose'. The question then is, when
to use chose and when to use choose.
examples of wrongly using the word 'chose'.
He knew he would have to chose a new approach.
It should read:
He knew he would have to choose a new approach.
a second example:
He knew if he choose a new approach, etc.
correct:
He knew he chose a new approach, etc.

Suggestion. Say it aloud to yourself to see if it
sounds correct. If it doesn't sound right, it is
more than likely it isn't.
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