be
busy
后面跟行为动词时，动词用v-ing形式；
eg:
He
is
busy
making
the
model
plane.
be
busy
后面跟的是名词时，用with
eg:
He
is
busy
with
his
lesson.
be
busy
doing
sth侧重于动作
be
busy
with
sth
侧重于状态
意思都一样，可以互换。
He
is
busy
doing
homework.=
He
is
busy
with
homework.
前者：忙着做某事。后者：在某件事上很忙。
前者造句:i
am
busy
finish
my
schoolworks.
后者造句：i
am
busy
with
my
schoolworks.
无多大区别。
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