YOU SAID:

Surgeons must be very careful when they take the knife.

INTO JAPANESE

外科医は、彼らはナイフを取るときに非常に注意しなければなりません。

BACK INTO ENGLISH

When the surgeon takes a knife they have to be very careful.

INTO JAPANESE

外科医はナイフを取るとき彼らは非常に注意しなければなりません。

BACK INTO ENGLISH

When the surgeon takes a knife they must be very careful.

INTO JAPANESE

外科医はナイフを取るとき、彼らは非常に注意しなければなりません。