prefixes:1.i never said that!you must have misheard me.2.i a

We can form new words by adding prefixes or suffixes.Write down new words in the brackets after
the examples.Then try to list more words.
谁能帮我翻译一下这是什么意思？速度，谢谢

英文填充!关於prefixes/suffixes!
1.He was sitting __________________ in his seat on the train.(comfort)
2.I want to be a __________________ in the future.(teach)
3.He was acting in a very __________________ way.(child)
4.This word is very difficult to spell,and even worse is,it's __________________.(pronounce)
5.I couldn't find any __________________ in his theory.(weak)
6.You shouldn't have done that!It was very __________________ of you.(thought)
7.He didn't pass his exam,but he was __________________ for the second time.(succeed)
8.Some of the shanty towns are dreadfully __________________ .(crowd)
9.The team that he supported was able to win the__________________ .(champion)
10.There were only a __________________ of people at the match.(hand)

Fill in the following chart,listing the prefixes used for the amount of bytes shown:
Amount Prefix

Why do we classify prefixes according to their meaning while suffixes according to class?

请问英语语言学高手~题目是Prefixes occur at the beginning of a word,and modify the meaning of a stem,but usually do not change the part of speech of the original words.Do you think it is true?Support your answer with examples.