Dear Mr. Johnson,
How are you doing these days? It’s almost two months since we met each other last time. I miss you a lot.
Thank you so much for your help with my English study. Now I am faced with some new learning problems. I have some difficulty in comprehensive reading. My English teacher often says that only if we expand the reading quantity can we be admitted into a better university. But, I feel it difficult to understand English passages with the increase of vocabulary / for lack of vocabulary. Besides, I often feel nervous while reading English. All of the problems bring me great pressure. I am unable to remember words well and feel tired of learning English.
I really hope that you can give me some good advice on how to memorize new words and practice reading English. I believe I can make great progress in English with your help.
I would be grateful/thankful if you could give me some advice/help. （By the way, please come to China for a visit whenever it is convenient to you. I am looking forward to seeing you again.）