supposed、expected、alleged 1. supposed：形容词 “应该的；假定的；所谓的（根据规定、预期或他人声称）”（如 be supposed to do 应该做某事；the supposed cause 假定的原因；the supposed expert 所谓的专家）； 2. 核心搭配：“be supposed to do” 表 “应该做某事”（如 You are supposed to wear a seatbelt 你应该系安全带），否定式 “be not supposed to do” 表 “不应该做某事”； 3. 与 expected（形容词 “预期的；期望的”，如 the expected result 预期结果；be expected to arrive 预计到达）区别：supposed 侧重 “根据规定或常规应该”，expected 侧重 “根据预期会发生”（be supposed to finish on time 应该按时完成，be expected to finish on time 预计会按时完成）； 4. 与 alleged（形容词 “声称的；所谓的（未经证实的）”，如 the alleged thief 所谓的小偷；the alleged crime 声称的罪行）区别：supposed 可表 “应该” 或 “假定”，alleged 仅表 “未经证实的声称”（the supposed truth 假定的真相，the alleged truth 声称的真相（未证实））。
精选例句
高考
1、 You are supposed to finish your homework on time every day.
你应该每天按时完成作业。（supposed是suppose的过去分词，常用搭配be supposed to do sth，意为“应该做某事”，是初中重点短语用法）
文