语法：They have long tails for keeping balance when climbing the tree.When doing?为何省略they are 什么情况下可以省略

They have long hair? do they have语法对吗? 语法：They have long tails for keeping balance when climbing the tree.When doing?为何省略they are 什么情况下可以省略 known,how long,have they,each other they have long hair 改一般疑问句 They have long legs的同义句 译中文：Do they have long legs? Do they have long legs改为陈述句 how long have they 还是用them how long have they 还是用them They are very tall.They walk sowiy.They have long legs and long necks.是什么动物 They are very tall.They walk sowiy.They have long legs and long necks. l have long black hair为什么不能变成l have black long hair什么语法啊 英语：how long have you been collecting shells?主要语法 They have long noses.They have long noses.(对画线部分提问）----------------______do they ______ ______? how long have they been dating和how long have they dated?区别?how long have they dated?也不一定以后他们就不date了啊? They have long noses对划线部分提问,（have long noses是划线部分） They have some long green shirt.(一般疑问句)