11 I fear for you, that somehow I have wasted my efforts on you.

11 I am afraid I may have labored over you in vain.

11 I fear for you. Perhaps all my hard work with you was for nothing.

11 I am afraid for you, lest I have labored for you in vain.

11 I am afraid for you, that my work for you has been wasted.

11 I am afraid of you, lest by any means I have bestowed labor upon you in vain.

11 I am afraid of you, lest indeed I have laboured in vain as to you.

11 I’m afraid for you. Maybe the hard work I spent on you has been wasted. 

11 I am fearful for you, that perhaps my labor for you has been wasted.

11 I am afraid that my work for you may have been wasted.

11 I am afraid for you, lest perhaps I have labored for you in vain!

11 I am afraid for you. I am afraid that somehow I have wasted my efforts on you.

11 I fear for you, that perhaps I have labored over you in vain.