慌てていたとはいえ宛先を間違ってしまうなんて。
- Even though I was in a hurry, I can’t believe I sent it to the wrong address.

慌てていたとはいえ宛先を間違ってしまうなんて。 meaning: To think that I made a mistake with the address, even though I was flustered!

⚫︎ とはいえ is a conjunction used to indicate a concession. It means "although," "even so," or "nevertheless." ⚫︎ It is placed after a clause (usually in the past tense or the -te form) that presents a fact or a condition. ⚫︎ It then introduces a contrasting or unexpected result or situation in the following clause. ⚫︎ The sentence structure is: Clause (Fact or Condition) + とはいえ + Clause (Result or Unexpected Situation). ⚫︎ In this sentence: 慌てていた (was flustered) is the fact, and 宛先を間違ってしまうなんて (to make a mistake with the address) is the unexpected result.

⚫︎ 〜てしまう is an auxiliary verb construction indicating completion, regret, or that something has happened unintentionally. ⚫︎ It combines the -て form of a verb with the auxiliary verb しまう, which conjugates like a standard u-verb. ⚫︎ しまう can express regret, a feeling of "what a shame" or "how unexpected." ⚫︎ In the sentence, 間違ってしまう indicates that the speaker regrets making the mistake. ⚫︎ The basic conjugation is: Verb (stem) + て + しまう (conjugates to the tense).

⚫︎ なんて is a particle used for emphasis, often expressing surprise, disbelief, or slight annoyance. ⚫︎ It typically follows a verb or a phrase and adds a feeling of "What!" "To think that!" or "How...!" ⚫︎ In the given sentence, it amplifies the speaker's surprise at the error, making the overall feeling stronger. ⚫︎ It often follows a verb or adjective phrase and adds a nuance of disbelief or negative emotion.

⚫︎ The verb 慌てる (to be flustered/hurried) is in the past imperfective tense 慌てていた. ⚫︎ This form uses the -te form, followed by the auxiliary verb いる which indicates a state of being in progress. ⚫︎ いた is the past tense form of いる, indicating the state of being flustered was ongoing. ⚫︎ The -て form is used to connect clauses and show the preceding condition or action.

⚫︎ The particle を marks the direct object of a transitive verb. ⚫︎ In the sentence, 宛先 (address) is the object of the verb 間違ってしまう (to make a mistake). ⚫︎ Therefore, 宛先 is followed by the particle を. ⚫︎ This highlights that the address is the direct thing which was mistakenly acted upon.