当然了。用英语怎么说 ? 

当然了。的英语翻译是:

Certainly.

句子单词讲解

1. certainly
单词释义: adv.无疑;当然;确定;肯定
应用场景: CET4|TEM4|考 研|CET6
相关短语:
她肯定会保持独身。
She will certainly remain single.
她肯定会保持独身。
She will certainly remain single.