1）颜色语种和国名如 in black; in English; in Canada
2）在称呼或表示官衔，职位的名词前不加冠词。
例:The guards took the American to General Lee. 士兵们把这个美国人送到李将军那里。

习惯用零冠词的固定短语: 
一、介词+零冠词+名词
at present
beyond hope of
by chance
by day
by hand
by rule
face to face
from beginning
hand in hand
in battle
in danger of
in defence of
in fact
in fear
in hopes of
in issue
in place of
in spit of
in time
on account of
on business
on earth
on credit
on foot
on hand
out of date
side by side
with credit
二、动词+零冠词+名词
cast anchor
catch fire
change gear
get fun
give battle
give way
lose heart
make way
send word
set sail
三、动词+零冠词+名词+介词
catch sight of
do duty for
find fault with
make use of
set fire to
take hold of
take exception to
take part in
take care of