Read each pattern and its example, then write your own sentence on the line.
〜て以来 V-て + 以来 ／ N + 以来
Marks a starting point in the past: ever since X happened, a state or tendency has continued unbroken. Slightly formal; common in writing and polite speech, and normally followed by an ongoing situation.
転職して以来、休日もほとんど仕事のことを考えている。 Ever since I changed jobs, I've been thinking about work even on my days off.
〜てからでないと V-て + からでないと／からでなければ（後に否定表現）
Says the second action is impossible or not permitted until the first one is finished. The main clause is negative or expresses difficulty. Fairly formal; frequent in instructions and business speech.
部長に確認してからでないと、返事はできません。 I can't give you an answer unless I check with the manager first.
〜ないうちに V-ない ／ i-adjくない ／ na-adjでない + うちに
Do something while a situation has not yet changed: before it gets dark, before you forget. Neutral register, used freely in everyday spoken and written Japanese.
暗くならないうちに家に帰りましょう。 Let's go home before it gets dark.
〜最中に V-ている + 最中に ／ N + の最中に
Stresses that something happened right in the middle of an ongoing activity, almost always as an interruption. Neutral but emphatic; common in both conversation and writing.
会議の最中に携帯電話が鳴ってしまった。 My mobile phone rang right in the middle of the meeting.
〜ところに / 〜ところへ V-dict ／ V-ている ／ V-た + ところに（ところへ）
Marks the exact moment at which something else happens, often an interruption or a timely arrival. Used in speech and writing; ところへ feels slightly more like movement toward the scene.
出かけようとしているところに、電話がかかってきた。 Just as I was about to go out, the phone rang.
〜かと思うと V-た（V-ている）+ かと思うと／かと思ったら
Two events follow each other almost instantly, usually with surprise or against expectation. Used for events you observe, not for your own plans. Natural in both conversation and writing.
息子は帰ってきたかと思うと、すぐに遊びに出て行った。 No sooner had my son come home than he went straight back out to play.