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I got the wrong answer when playing the 'JLPT Taisen' japanese game. The
question is: "田中さんとは、学校を_____以来、会っていない". I think the answer is "卒業した", but
"卒業して" is correct.

Please teach me why?

[![JLPT Taisen
question](https://i.stack.imgur.com/HYR0f.jpg)](https://i.stack.imgur.com/HYR0f.jpg)
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2019-01-28T08:27:52.190
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question
grammar tense
「卒業して以来」と「卒業した以来」どちらが正しいですか？
「~て以来」 is a set phrase. You just use it like that. It means "since + (an
action described by a verbal sentence)".  
[https://japanesetest4you.com/flashcard/learn-jlpt-n2-grammar-ていらい-te-
irai/](https://japanesetest4you.com/flashcard/learn-
jlpt-n2-grammar-%E3%81%A6%E3%81%84%E3%82%89%E3%81%84-te-irai/)

「~た以来」does not have any sense. It is not possible to precede 以来 with a verb in
the ~た form.
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answer