改写下列句子,用He做句子的主语.

He's learning English.
He will see you tomorrow.
He can understand you.
He must write a letter.
He may come next week.
He did a lot of work yesterday.
He played football yesterday.
He bought a new coat last week.
He has had a letter from Tom.这句话要把have改成has,因为是第三人称单数.