1. The problem is too difficult/hard for me to solve.
2. The problem is so difficult/hard that I can't solve it.
3. The problem is very difficult/hard so that I can't solve it.
4. The problem isn't easy enough for me to solve.
5. This is such a difficult/hard that I can't solve it.
6. This is so difficult/hard a problem that I can't solve it.
注：/ 表示可以任意选用其一；
还可以把solve改写成work out，solve it改写成work it out.
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