writing letter为什么用writing

writing letter为什么用writing Are you writing a letter?回答可以用Yes,it is吗 为什么 I am writing a letter you in my school为什么 writing a letter是什么意思 writing a letter是什么意思 这里为什么要用动词不定式?After reading the letter,he went on (to write)a reply.为什么不用writing? she is writing a letter now.(用tomorrow改写句子) tom is writing a letter.the letter is _____ jim用介词填空 I'm writing a letter writing a letter怎么读? She's writing a letter 翻译is writing a letter look he is （writing） a letter to hislook he is （writing） a letter to his mother这句话为什么添加ing,急, Write your first letter this week.在这句话中,write为什么不用ing形式?Writing the letter,even if it isn't sent,would do just that.而在这句话中,write为什么用ing形式? AS i was writing a letter ,Robert is came to visit me.为什么前面用过去进行时,后面用过去时 我用的是n=wr做的是C.可为什么答案是D? 用grandpa、writing、is、in、a、letter、the、room(?)组成一句话 My brother is writing a letter to his friend now (用tonight)