YOU SAID:

I have swapped back and fourth between the two.

INTO JAPANESE

私はその2つを交互に使用してきました。

BACK INTO ENGLISH

I've been alternating between the two.

INTO JAPANESE

私はその2つを交互に使っています。

BACK INTO ENGLISH

I alternate between the two.

INTO JAPANESE

私はその2つを交互に使います。

BACK INTO ENGLISH

I alternate between the two.