用英语写一封给妈妈的信

Dear Ma:
How are you? I am very well. Keek in touch, goodbye.
Your Son
XXX

Dear mum:
Hi my dear mum, wu have not seen for a long time.How are you? Did you have a cold? I study very hard, and the mark is not bad.If you are not busy, you can visit our school. I am looking forward to your letters. Last, I want to say:"I love you mum.”
keep healthy
your son
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你都没说信要表达什么思想哇