急に時計がないのに気がついた。

English Translation

I suddenly noticed that my watch is missing.

Tips for word order.

A: 時計がないのに急に気がついた。= I suddenly noticed that my watch is missing.

B: 急に時計がないのに気がついた。= 1) I noticed that my watch suddenly disappeared.; or 2) I suddenly noticed that my watch is missing.

If you mean that you lost the watch long time ago but you’ve just realized it, word order A is better or less vague than B.

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