英语单词的词性怎么转换?有规律的吗?最好全面一点.

apology(n.)-(v.) apologize
build(v.)-(n.) building
clean(a.)-(v.) clean
correct(v.)-(a.) corrective
Different(a.)-(n.) Difference
difficult(a.)-(n.) difficulty
certain(a.)-(ad.) certainly
east(n.)-(a.) eastern
foolish(a.)-(n.) fool
mix(v.)-(n.) mixture
operation(n.)-(v.) operate
weigh(v.)-(n.) weighty
foreign(a.)-(n.)foreigner
real(a.)-(ad.) really
fast(a.)-(ad.) fast
friend(n.)-(a.) friendly
love(v.)-(a.) lovely
clear(a.)-(ad.) clearly
travel(v.)-(n.) traveling
worry(v.)-(a.) worried
wide(a.)-(ad.) widely
hurry(n.0-(v.)hurry
再问： 有规律性的吗？
再答： 其实没必要这样，见得多了，自然就会了，有的有规律，有的没规律，需要特殊记忆。