～つもりだった

About

～つもりだった (lit. "X was intended") can have two possible meanings, depending on what precedes it.

「(Present tense verb)つもりだった」 means we meant to do something, but didn't end up doing it.

E.g. それは完成かんせいさせるつもりだった。 "I intended to finish that."

「(Past tense verb)つもりだった」 means we are sure that we did do something, despite evidence otherwise.

E.g. それは完成かんせいさせたつもりだった。 "I thought I finished that."

Summary

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  ～つもりだった has two possible meanings, depending on the verb it follows

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  If it follows a present tense verb, ～つもりだった means "I meant to do X, (but didn't end up doing it)"

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  If it follows a past tense verb, ～つもりだった means "I'm sure I did X (despite evidence to the contrary)"