~つもりだった・~つもりで
Contrast an earlier intention, a personal belief, and an imagined situation
You’ll be able to contrast what you had intended with what you believed you had done, and describe acting with an imagined role or situation in mind.

帽子を持ってきたつもりでしたが、家に忘れてきました。
boushi o motte kita tsumori deshita ga, ie ni wasurete kimashita.
What do you think this sentence means?
I thought I had brought my hat, but I left it at home.
Express an intended belief versus reality
~つもりだった looks back on a personal belief or intention that turned out differently in reality. Relatedly, ~つもりで describes acting with a specific assumption or imagined situation in mind.
早く寝るつもりだったが、映画を見てしまった。
hayaku neru tsumori datta ga, eiga o mite shimatta.
I meant to go to bed early, but I ended up watching a movie.
旅行に行ったつもりで、そのお金を貯金した。
ryokou ni itta tsumori de, sono okane o chokin shita.
I saved that money, telling myself I had already been on the trip.
Forming intended states and assumed mindsets
Use verb past + つもりだった to express what you assumed you had done, or verb plain non-past + つもりだった for an unfulfilled intention. Use 〜つもりで to show acting with a certain assumption or imagined posture.
プロになったつもりで、毎日真剣に練習している。
puro ni natta tsumori de, mainichi shinken ni renshuu shite iru.
I practice seriously every day with the mindset of having become a professional.
~るつもりだった vs ~たつもりだった
With the dictionary form, つもりだった says you meant to do something but did not. With the た-form, it says you believed you had done it, but you were wrong.
~るつもりだった, meant to
窓を閉めるつもりだった。
mado o shimeru tsumori datta.
I meant to close the window.
An intention that didn’t happen.
~たつもりだった, thought I had
窓を閉めたつもりだった。
mado o shimeta tsumori datta.
I thought I had closed the window.
A mistaken belief.
メールに資料を付けたつもりだったが、相手から「届いていません」と連絡が来た。
meeru ni shiryou o tsuketa tsumori datta ga, aite kara "todoite imasen" to renraku ga kita.
I thought I had attached the document to the email, but the other person told me, "It hasn’t arrived."
今日こそ部屋を片付けるつもりだったのに、一日中ごろごろしてしまった。
kyou koso heya o katazukeru tsumori datta noni, ichinichijuu gorogoro shite shimatta.
I meant to clean my room today for sure, but I ended up lazing around all day.
本番の試合のつもりで、練習でも全力で走りなさい。
honban no shiai no tsumori de, renshuu de mo zenryoku de hashirinasai.
Run with everything you’ve got, even in practice, as if it were the real match.
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