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Is there a serious difference between the following three sentences:

  • I put the toys in the box.

  • I put the toys into the box.

  • I put the toys inside the box.

1

No significant difference between them - in this context. It is a matter of choice and personal style. Nevertheless, people prefer the shorter way as usual: "he is putting the toys in the box".

In other contexts may be differences between them. Be aware that normally the word "into" is a preposition for movement or transformation while inside is preposition for location. Also see that and this.

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