yesterday li nan heard from his pen friend, mike. he is a canadian and he is as old as li nan. mike is interested in china and things related to china. so he is learning chinese. he will visit china soon.

　　from his letter li nan knew that he had some trouble in the grammar. it is difficult for a foreigner to learn chinese as it is difficult for chinese students to study english well. he needs li nan's help.

　　li nan hopes he can come to china soon. then he can help mike learn chinese and mike can help him with his english.