While words like "unexpected" and "anticipate" might seem like they have prefixes related to "expect", they actually have their own distinct meanings and origins.
* Unexpected is formed from the prefix "un-", which means "not", and the word "expected".
* Anticipate comes from the Latin word "ante", meaning "before", and "capere", meaning "to take".
Therefore, there are no prefixes specifically used to modify the meaning of "expect".