1、The exam was very difficult. I had a hard time answering the questions.
这次考试非常难，我答题很费劲。
2、He finds it difficult to make friends because of his shy personality.
由于他内向的性格，他觉得很难交到朋友。
3、Learning a new language can be difficult, but with practice, it becomes easier.
学习一门新语言可能很难，但通过练习，它会变得更容易。