YOU SAID:

I lost my dog at the beach and saw a shark swim

INTO JAPANESE

私はビーチで犬を失い、サメが泳ぐのを見た

BACK INTO ENGLISH

I lost my dog on the beach and saw a shark swim.

INTO JAPANESE

私はビーチで犬を失い、サメが泳ぐのを見ました。

BACK INTO ENGLISH

I lost my dog on the beach and saw sharks swim.

INTO JAPANESE

私はビーチで犬を失い、サメが泳ぐのを見ました。

BACK INTO ENGLISH

I lost my dog on the beach and saw sharks swim.