关于the 90sthe 90s一定要加the?

关于the 90sthe 90s一定要加the? the food 后面加不加sThe food ___(尝）so wonderful.要不要加s? the party starts at half past ten 为什么加Sthe party starts at half past ten start为什么加S cost 什么时候加sThe blue pants cost more than the green pantsThe purple bicycle costs less than the green bicycle为什么cost 一个加s一个不加 用英语表示年代the 1980sthe 1850s 英语 为什么这里加S,哪里没加SThe chemical factory produces terrible gas.He hopes to find the money to produce a film about Japan. 为什么一个produce加S一个没加 英语 OF 'Sthe mouse of the computercomputer's mice这两句对吗？ 名词所有格的问题the nose of Tommy'sthe nose of TommyTommy's nose 名词的格'sThe girl's name= the name of the girlMy father's friend = the friend of my father's为什么the name of the girl后面不用加's,而the friend of my father's后面要加? He became famous around the word_____?in the 1990in the 1990sin 1990sthe 1990s the car which is repairing is ton'sthe car which is repairing is Tom's句中是定语从句,which let当作动词使用时,单三要不要加SThe doctor let Michael rest for a few days.这句的let要不要加s啊? one of 后面要先加the 可是 英语课本上有这么一句话：one of the Thailand’s symbol.the 和Thailand’sthe 和Thailand’s the days are long为什么要加Sthe days are long and the nights are short.还有the sun rises early and sets late The book is one of ____ ALily's sister BLily's sister's book CLily's sister's DLily sister'sThe book is one of ____ALily's sister BLily's sister's book CLily's sister's DLily sister's The book is one of ____ ALily's sister BLily's sister's book CLily's sister's DLily sister'sThe book is one of ____ALily's sister BLily's sister's book CLily's sister's DLily sister's 英语名词复数问题我写作的时候 不知道什么时候用名词时应该加S 什么时候不该加Sthe memory the memories 都是表示记忆 这点很让我头疼不要给我复制 英语名词 复数的构成规则 在英语写作中 如 the story is set in england in the early 1800sthe story is set in england in the early 1800s翻译成中文