provideprovisioncollidecollision invadeinvasion invasivedecide---decision----decisive persuade---persuasion---persuasive include---inclusion---inclusive expand---expansion conclude---conclusion---conclusive 但:attend-attention; suicide ---suicide ['su:isaid] 自杀 类似:admit-admission permit-permission 其中以-end结尾的动词,往往有-ent结尾的 名词与之对应: extendextent, descenddescent,等等。 但:ascendascension