"Write a letter to your friend telling him what have happened."中的telling为何要加ing?

write a letter=write to sb? write a letter to的同义词是什么 write a letter to sb.可以吗 how to write a formal letter? i want to write a letter ___mother 给你写一封信是write you a letter还是 write to you a letter I am going to write a letter.对write a letter部分提问 he is going to write a letter write a letter就划线部分提问 write a letter翻译. l__________________________(write)a letter. to write a letter to read the newspaper 的意思 write a letter to you 中的 to为什么不是for Write a letter to your friend introducting a place Write a letter to ask for a pen pal write a letter to ask for a pen Who would you like to write a letter----- (to ,with)是to write sth to sb? She ____ (write) a letter to them every year. Their teacher asks them to write a letter i____ English.