Как будет по английски: Это очень трудно,я не в мощах этого

This is very hard, I cant solve it.

Its too difficult, I fail to handle it.

It is so tough, I am unable to settle it.

This is very tricky, Im not able to work it out.

It is so complicated, Im helpless at fixing this.

This is very problematic, I can not make a decision.