Question

【题目】To understand American English is a little difficult.(改为同义句)
a little difficult American English.

Answer 1

【答案】It's；to；understand
【解析】句意：要理解每个英语有点困难。这个句子是动词不定式短语作主语构成的系表结构，可转换为It is +形容词+动词不定式短语。所以答案是：It's, to understand。