记单词记不住怎么办,有好的办法吗答:如:把“sign”(记号)中的“ign”变成“ing”,重新组合成“sing”(唱歌),然后用“sing”记住“sign”;把“ear”(耳朵)中的“e”放在“ar”后,重新...(轻);义相同: also/too/either, ago/before/past, each/every/all, because/as/for;义相反: yes/no, old/new, right/wrong, up/down, young/...
现在完成时的所有知识,特别是短暂性动词与延续性动词,since 能不与短暂...答:for, since, so far, ever, never, just, yet, till / until, up to now, in past years, always, 不确定的时间状语 3)现在完成时可表示持续到现在的动作或状态,动词一般是延续性的,如live, teach, learn, work, study, know. 过去时常用的非持续性动词有come, go, leave, start, die, finish, ...