He said that he had some trouble in the grammar and asked Li Nan for help. He told Li Nan that he was going to visit China and meet him in Beijing this summer.
他说他有些语法问题弄不懂，想要得到李南的帮助，他还告诉李南今年夏天来中国参观井看望李南。
From his letter Li Nan knew that he had some trouble in the grammar.
从他的信中李南知道他遇到一些语法问题。
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