certain的副词

副词形式是certainly，例如：

1、I can certainly feel the effects of too many late nights.我当然能感受到熬夜太多产生的影响。

2、Beating the world champions is certainly a big ask for the team.这个队要打败世界冠军当然难度很大。

3、Certainly， the early years are crucial to a child's development.毫无疑问，幼年对儿童的成长至关重要。

certain的副词

副词: certainly

adv. 当然行（用于回答）必定She certainly knows what's what.

她当然知道轻重缓急。

I'm certainly not scared of him.

我当然不怕他。

The story is almost certainly false.

这个故事几乎肯定是虚构的。

I'm certainly never going there again.

我肯定不会再去那里了。