YOU SAID:

I decelerate quickly.

INTO JAPANESE

私はすぐに減速します。

BACK INTO ENGLISH

I will slow down quickly.

INTO JAPANESE

私は、すぐに、遅くなります。

BACK INTO ENGLISH

I will soon slow.

INTO JAPANESE

私はすぐに遅くなります。

BACK INTO ENGLISH

I will soon slow down.

INTO JAPANESE

私はすぐに遅くなります。

BACK INTO ENGLISH

I will soon slow down.