In this usage, 〜ないで functions similarly to "instead of doing A," often followed by an alternative action. The response may state what the speaker does in place of the omitted action. The negative forms used here are noranaide (not taking), kawanaide (not buying), sutenaide (not throwing away), and ikanakatta (did not go). Note that example 4 uses ikanakatta de — a colloquial variant that combines the past negative with で. In more formal or textbook Japanese, you would expect doko mo ikanakatta without the で, or a phrasing like doko mo ikanakatta node . However, in natural spoken Japanese, the で can be omitted and the sentence can be interpreted as two independent clauses.
For detailed step-by-step guidance, many learners recommend the Minna no Nihongo Lesson 34 Practice B Video Vocabulary Practice: Review this lesson's specific verbs like kumitatemasu (assemble) and migakimasu (polish) on sentence transformations from this lesson?