Explanation
1. āĻĒāϰā§āĻā§āώ āĻĒā§āϰāĻļā§āύ⧠āĻāύāĻāĻžāϰā§āĻļāύ (inversion) āĻšā§ āύāĻž
āϏāϰāĻžāϏāϰāĻŋ āĻĒā§āϰāĻļā§āύ āĻāϰāϞ⧠āĻŦāϞāĻž āĻšā§, âWhen did he come?â āĻāĻŋāύā§āϤ⧠āĻĒāϰā§āĻā§āώ āĻĒā§āϰāĻļā§āύ⧠âdid he comeâ āύā§, âhe cameâ āĻšāĻŦā§āĨ¤ āĻ āϰā§āĻĨāĻžā§, āĻĒā§āϰāĻļā§āύā§āϰ auxiliary âdidâ āĻŦāĻžāĻĻ āĻĻāĻŋā§ā§ subject + verb āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻāϰāϤ⧠āĻšāĻŦā§āĨ¤
2. āĻāĻžāϞ āĻŽāĻŋāϞāĻŋā§ā§ āύāĻŋāĻā§āĻāĻŋ (Sequence of tenses)
āĻŽā§āϞ āĻŦāĻžāĻā§āϝ âI donât knowâĻâ āĻŦāϰā§āϤāĻŽāĻžāύ āĻāĻžāϞ (present tense) āĻšāϞā§āĻ subordinate clause-āĻ (āϝ⧠āĻ āĻāĻļā§ āĻāĻŽāϰāĻž āϤāĻĨā§āϝ āĻāĻžāύāϤ⧠āĻāĻžāĻ) āĻ āϤā§āϤ⧠āĻāĻā§ āϝāĻžāĻā§āĻž āĻāĻāύāĻž āĻāϞā§āϞā§āĻ āĻāϰāϞ⧠āĻ āϤā§āϤ āĻāĻžāϞ āĻŦā§āϝāĻŦāĻšā§āϤ āĻšā§āĨ¤ āϤāĻžāĻ âwhen he cameâ āϏāĻ āĻŋāĻ, âwhen he will comeâ (āĻāĻŦāĻŋāώā§āϝā§āĻāĻžāϞ) āĻšāĻŦā§ āύāĻž āϝāĻĻāĻŋ āĻŦā§āĻāĻžāϤ⧠āĻāĻžāĻā§āĻž āĻšā§ āϝ⧠āĻāĻŽāϰāĻž āĻ āϤā§āϤ⧠āϤāĻžāϰ āĻāĻāĻŽāĻŖā§āϰ āϏāĻŽā§ āĻāĻžāύāĻŋ āύāĻžāĨ¤
3. āĻ āύā§āϝāĻžāύā§āϝ āĻ āĻĒāĻļāύ āĻā§āύ āĻāĻžāϰāĻžāĻĒ
- âwhen he will comeâ āĻŦāϞāϞ⧠āĻŦā§āĻāĻžāĻŦā§ āĻāĻĒāύāĻŋ āϤāĻžāϰ āĻāĻŦāĻŋāώā§āϝ⧠āĻāĻāĻŽāĻŖā§āϰ āϏāĻŽā§ āĻāĻžāύā§āύ āύāĻž, āĻāĻŋāύā§āϤ⧠āĻĒā§āϰāĻļā§āύ⧠āĻ āϤā§āϤā§āϰ āϤāĻĨā§āϝ āĻāĻžāĻā§āĻžāĨ¤
- âwhere does he goâ āĻ âwhere did he goâ āĻĻā§āĻā§āϰ āĻā§āώā§āϤā§āϰā§āĻ āϏāϰāĻžāϏāϰāĻŋ āĻĒā§āϰāĻļā§āύā§āϰ āĻĢāϰāĻŽ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻšā§ā§āĻā§; āĻĒāϰā§āĻā§āώ āĻĒā§āϰāĻļā§āύ⧠âwhere he goesâ āĻ āĻĨāĻŦāĻž âwhere he wentâ āĻšāĻā§āĻž āĻāĻāĻŋāϤ, āĻāĻŋāύā§āϤ⧠āĻāĻāĻžāύ⧠āĻā§āĻĨāĻžāĻ âknowâ āĻŦāĻžāĻā§āϝā§āϰ āĻĒāϰ āϝā§āĻā§āϤ āĻāϰāĻž āϝāĻžā§ āύāĻžāĨ¤
āϏāĻžāϰāϏāĻāĻā§āώā§āĻĒāĻ
âI donât know when he came.â āĻŦāĻžāĻā§āϝ⧠āϏāĻžāĻŦāĻ āϰā§āĻĄāĻŋāύā§āĻ āĻā§āϞāĻā§ āĻ āϤā§āϤāĻāĻžāϞ āĻ āϏāĻžāϧāĻžāϰāĻŖ āĻŦāĻžāĻā§āϝ āĻŦāĻŋāύā§āϝāĻžāϏ (subject + verb) āĻŦā§āϝāĻŦāĻšā§āϤ āĻšā§ā§āĻā§, āϝāĻž āĻĒāϰā§āĻā§āώ āĻĒā§āϰāĻļā§āύ⧠āĻšā§āĨ¤ āϤāĻžāĻ âwhen he cameâ āĻšāϞ āϝāĻĨāĻžāϝāĻĨ āĻāϤā§āϤāϰāĨ¤
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