Could you explain them for me?

来源：百度知道 编辑：UC知道 时间：2024/05/30 10:10:53
According to the recent research,heavy coffee drinking and heart attack IS not necessarily casue and effect.
1.think about why use it not are.
2.why use necessarily not necessary?

because "heavy coffee drinking and heart attack "
is a thing,因为它是一件事，咖啡与心脏病这一项研究，其实是指代the recent research这一件事

necessarily是ADV，副词，修饰cause and effect necessary 是形容词，

cause和effect都是动词 动词前要用副词 necessarily

根据最新的调查结果，经常喝咖啡并不一定是引发心脏病的原因