The word "haven't" is an abbreviation of "have not" (the apostrophe takes the place of the letter "o").
You can, therefore, use "haven't" in any situation where you can use "have not." Here's an example:
"We have not eaten peaches since the summer began" is exactly the same as "We haven't eaten peaches since the summer began."
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1. Until now i haven't been to London. 2. What have you been doing until now? 3. Until now i havent tried Chinese food.
many scientist havent determine what cause ice ages.
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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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