You could say something like this:
There was a lot of predjustice going on when african-americans had no rights, but then Martin Luther King gave a powerful speech, that brought african-americans rights.
robrto obstices in life were when he was alwayed faced with prejustice and bias.
prejustice is when somebody judges you based on the way that you look, your race, your gender, your sexual preference, or even your religion, before they get to really know what kind of person that you are.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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