An adverb meaning 'soon' or 'shortly'; indicates that something will happen in the near future or is almost the case.
電車はもうすぐ到着します。
The train will arrive soon.
もうすぐ試験が始まるから、最後の復習をしよう。
The exam will start soon, so let's do a final review.
残りはもうすぐ終わるよ。
The rest will be finished soon.
もうすぐ雨が降りそうだ。
It looks like it will rain soon.