複雑だ
The problem is complicated.
問題が複雑です
The problem is very complicated.
問題がとても複雑です
The last problem is very complicated.
最後の問題がとても複雑です
The last problem on the exam is very complicated.
試験で最後の問題がとても複雑です
The last problem on this exam is very complicated.
今回の試験で最後の問題がとても複雑です