  We highlight the challenges faced by non-native speakers when using AI
writing assistants to paraphrase text. Through an interview study with 15
non-native English speakers (NNESs) with varying levels of English proficiency,
we observe that they face difficulties in assessing paraphrased texts generated
by AI writing assistants, largely due to the lack of explanations accompanying
the suggested paraphrases. Furthermore, we examine their strategies to assess
AI-generated texts in the absence of such explanations. Drawing on the needs of
NNESs identified in our interview, we propose four potential user interfaces to
enhance the writing experience of NNESs using AI writing assistants. The
proposed designs focus on incorporating explanations to better support NNESs in
understanding and evaluating the AI-generated paraphrasing suggestions.
