The boy is often too busy writing to his father.中为什么用writing

The boy is often too busy writing to his father.中为什么用writing he is very busy(writing)his papers.he is far too busy（to rec His father is writing是什么意思 1.I'm too busy ( ) to my family often.A.writing B.to write C Wang Bing is writing an e-mail to his friend now.用often替换now father is busy writing postcards this morning and /has writt Father is busy writing postcards this morning and______ten s I'm sorry,I'm too busy ______to you A.writing B.to writing C liuchang is writing to his e-pal. Mike is writing a letter to his father (改为同义句） mike is writing a letter to his father.改为同义句 the teacher often r_____the boy to his father