YOU SAID:
We must commence the destruction of mankind
INTO JAPANESE
我々は人類の破壊を開始しなければならない
BACK INTO ENGLISH
We must start destroying mankind
INTO JAPANESE
私たちは人類を破壊し始める必要があります
BACK INTO ENGLISH
We need to start destroying mankind
INTO JAPANESE
我々は人類を破壊し始める必要がある
BACK INTO ENGLISH
We need to start destroying mankind
That didn't even make that much sense in English.