Answer:
1. Polite
2. Destroy
3. Wind
4. Trade
5. Spoil
6. Necessary
7.Walk
Explanation:
A root word is the base of a word that has no prefixes or suffixes. A prefix or suffix is a word part that is added to the beginning or end of a word to change the meaning. Common suffixes change the verb tense like -ed or -ing. Prefixes like re- change how the action is performed. For example, rewind means that it is something being winded up again as opposed to for the first time.
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Maybe he meant that for him is hard to write or create a realistic idea about what to write and how.