YOU SAID:

Fumes and gases can be dangerous

INTO JAPANESE

煙やガスは危険である可能性がある

BACK INTO ENGLISH

Smoke and fumes can be dangerous

INTO JAPANESE

煙やガスは危険です

BACK INTO ENGLISH

Smoke and gas are dangerous

INTO JAPANESE

煙とガスは危険です

BACK INTO ENGLISH

Smoke and gas are dangerous