请问如何将'' I think it is hard to learn English well '改为否定句.

请问如何将'' I think it is hard to learn English well '改为否定句. 如何将I think I will learn English hard.改为双重否定句 I think that it is important to learn English well .(改为简单句） I think it is not easy to learn English well.这个句子为什么不用否定前移啊? l think that it is important to learn English well改为简单句 I think it necessary to learn english well.同义句 I think it hard to learn English well if we don't work hard I think that it is important to learn English well.(同义句转换) I think it is important to learn English well.的同义句 将I find it is useful to learn English well. I find it is easy for children to learn English well.(改为同义句） 将“I find it is useful to learn English well"转换成同义句"I find --