Question

まりな

Only〜からの文で倒置が起こるのは分かりましたが、didの役割がよく分かりません。
誰か教えて頂きたいです😭

72
→解答 本冊 170ページ)
daiainl
Once a device had been invented, the inventor then had to find
an application for it. ®Only after it had been in use for a
considerable time did consumers come to feel that they “needed”
3ot
it.
(熊本大学)
に
七の他の重要項目

→問題 別冊 77ページ
72
倒置の
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[Once sa device yhad been invented], sthe inventor then vhad to
従接
2
find oan °application (for it). °[Only lafter sit v had been (in use)
従接
(for a considerable time)] did sconsumers ycome to feel o [that|
従接
sthey v"needed” oit].