2。3。3句中有非限制性的词或短语之类，以逗号标出以示插入成份：

1。Herhusband，Bill，isascientist。(Bill为插入成份)

2。KentHoward，myEnglishteacher，isfromAmerica。(插入成份myEnglish

teacher)

3。Herfather，whoisafamousscholar，teachesEnglish。(插入成份whoisa

famous scholar)

4。 Eleanor， his wife of thirty years， suddenly decided to open her own

2。3。4句中的城市名如果和它的省、州、国名并列，省、州、国名前后须加逗号：

1。WevisitedHartford，Connecticut，lastsummer。(Connecticut为插入成份)

2。Paris，France，issometimescalled"TheCityofLights。"(France为插入

成份)

3。 Hartford， Connecticut"s investment in the insurance industry is well

known。(Connecticut"s为所有格式，后面不可加逗号喔)

2。3。5句中带着连接词(but，and，or。。。)的插入成份的前面不可加上逗号：

1。 The Red Sox were leading the league at the end of May， but of

course，theyalwaysdowellinthespring。(but的后面不可加逗号)

2。 The Tigers spent much of the season at the bottom of the league， and

even though they picked up several promising rookies， they expect to be

thereagainnextyear。(and的后面不可再加逗号)

2。3。6

向人说话时，逗号放在对方名字或称谓之后、之前或者前后都加：

1。

John，comehere。(John，逗号在名字之后)

2。

Openthedoor，John。(，John逗号放在名字之前)

3。

It is， Sir， not my fault。

(，Sir，逗号放在称谓前面和后面)

2。4

替代句子里某个成份

2。4。1用逗号替代句子里某部份，表示字词的省略：

1。 The lion is the symbol of courage; the lamb， of meekness。 (the lamb， of

meekness原本应该是thelambisthesymbolofmeekness)

2。Georgewasthehardworker，John，thelazyone。(John，thelazyone原

本应该是Johnwasthelazyone)