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I looked these words and means surely. Usually I see きっと, but is usual to use
さぞ?

きっとお疲れでしょう。

さぞお疲れでしょう。

It's ok use both?
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2014-12-31T05:08:08.677
21103
2014-12-31T12:43:15.077
2014-12-31T12:43:15.077
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7341
question
word-choice adverbs modality
Usage of さぞ and きっと
Both きっと and さぞ are adverbs of **epistemic modality** (which means they
express a type of uncertainty), but they're different in a number of ways:

  1. **Level of certainty**. きっと is more certain than さぞ. 

  2. **Frequency**. きっと is significantly more common than さぞ. 

  3. **Register**. きっと is normal in conversation. 

I've been told by more than one native speaker that さぞ sounds rather old-
fashioned.

  4. **Pragmatic restrictions**. This refers to which contexts a word is appropriate in.

さぞ is used under a narrower set of circumstances than きっと. When the speaker
uses さぞ, they're expressing sympathy with the hearer or the sentence subject.
It's somewhat subjective in nature. If this requirement isn't met, using さぞ is
inappropriate.

きっと doesn't have this requirement, so it can be used more generally.

  5. **Modal harmony**. This refers to co-occurrence with other expressions of modality.

The adverb さぞ is very likely to co-occur with だろう (or でしょう, etc.) as in your
example.

Although きっと also co-occurs with だろう, it appears without it more often than さぞ
does, and the greater degree of certainty means it's also possible for きっと to
harmonize with relatively certain expressions like にちがいない.

Although both adverbs are possible in your example, as you can see they're not
quite the same. By the way, さぞ is usually written in kana.

For more information about modality from a linguistics perspective, I
recommend Heiko Narrog's _Modality in Japanese_ (2009). Modal adverbs such as
きっと and さぞ are covered on pages 108-110.
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2014-12-31T06:17:41.950
21104
2014-12-31T06:17:41.950
21103
answer