1.
并列句有两个分句用and连接；有三个以上的分句时；前面的分句用逗号，最后两个分句用and连接。
He
helps
me
and
I
help
him.
Tom
is
from
New
York,
Peter
is
from
London,
Mary
is
from
Scotland,
Jim
is
from
Washington
and
Ann
is
from
Wales.
状语从句、介词短语一般置于句首时，若较长可用逗号跟主句分开，若较短也可以不用逗号;
置于句尾时，一般不用逗号。
When
it
is
six
in
the
morning(,)
she
begins
to
rise.
After
getting
up(,)
she
begins
to
brush
her
teeth
,wash
her
face
and
prepare
her
breakfast.
She
goes
to
work
at
half
past
seven.
She
doesn't
come
back
home
from
work
when
it
is
already
dark.
2.
逗号后用冠词与逗号无关，只跟后面的词语有关。
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