当然英文怎么说有几种说法?

"Of course" 可以用若干种方式表达：

"Of course"：这是一个常见的说法，意思是“当然”、“很显然”、“没问题”。
Example:
"Do you want to join us for dinner tonight?"
"Of course, I'd love to."
"Sure"：这是一个简短的说法，意思与 "Of course" 相同。
Example:
"Can you help me carry this box?"
"Sure, no problem."
"Certainly"：这是一个比较正式的说法，意思与 "Of course" 相同。
Example:
"Excuse me, can I have a moment of your time?"
"Certainly, what can I help you with?"
"Definitely"：这是一个比较强烈的说法，意思是“绝对”、“一定”。
Example:
"Do you think it's going to rain tomorrow?"
"Definitely, the forecast said so."