I m very glad to get a letter from you.句子中词组有哪些,

I m very glad to get a letter from you.句子中词组有哪些,

我很高兴收到你的信.
be glad to do 表示很高兴做.
get a letter from sb 表示收到某人的信.

be glad to do 高兴做
get a letter from sb 收到某人的来信