have为什么在后面是ing形式he added that having conversation with friends was helpful

have为什么在后面是ing形式he added that having conversation with friends was helpful I have a swimming lesson为什么swim用ing形式 He was tired after walking so long .为什么动词是ing形式的?是不是介词接动词ing 形式 have a look 有ing形式么? a skating champion为什么skate是ing形式? He spent a hour reading the letter为什么read用ing形式 为什么要用ing形式?1.he will be working with u from now on为什么不直接说成是He will work with u from now on?这句是什么时态?为什么要ING形式?2,how long have u been working here?WHY IS NOThow long have u worked here?是因 Weather (permit) ________,we’ll have a picnic at the beach next Saturday.主动形式就填ing么？到底是为什么呢 下面这句英文为什么要用ing形式?“All the people attending the meeting about trade yesterday have gone to HK for a visit．”这里为什么要用ing而不用ed?我指的是“attending　”。 为什么has/have been.后面的动词要是ing形式? have怎么改成ing形式 这个英语句子He was busy writing the story,only breaking off occasionally to have a cup of tea.意思是：他一直忙着写故事,只是偶尔停下来（break off）喝杯茶.这里 break 为什么要用 ing 形式?是跟前面的 only 这个 为什么Does he have a ping-pong ball?为什么这个句子是Have的第三人称单数形式为什么不变Has顺便讲下Has怎么用 英语句式词汇解析1He told us a disappoint thing中的disappoint为什么要用ing形式 He sat down and watched the cat play with a dog.那个play为什么不是ing形式或过去式 什么是感情类动词 就是可在后面加ed 或 ing 形式的 对人 加ed 对物 加ing主语是人 用ed 形式 主语是物 用ing 形式 I wished to be a teacher having fun with so many lovely students.为什么 have 是ing 形式啊我感觉是I wished to be a teacher have fun with so many lovely students.不知道有什么语法, I have all of my students working on a project...work 为什么要用ing形式?而不用原型?