They are writing a report about the negative effects of cell phones in school.→
A report is being written about the negative effects of cell phones in school.
Scientists are keeping a sick milu deer alive at the centre.→
A sick milu deer is being kept alive at the centre(by scientists).
4.如果用在现在进行时的句子中的谓语动词是动词短语或习惯用语,那么这个动词短语或习语只把动词变为被动语态,其他部分保持不变.例如：
The parents are taking good care of their test-tube baby.→
Their test-tube baby is being taken good care of(by the parents).
5.当用了现在进行时的句子结构是"S V In O DO"句型时,既可以把间接宾语变为被动句的主语,也可以把直接宾语变为被动句的主语,但如果是后者,可根据动词的习惯用法,把间接宾语改写为to或for引起的介词短语.例如：
George is sending his friend's phone texts and pictures.
His friend's phone is being sent texts and pictures(by George).
Texts and pictures are being sent to his friend's phone(by George).
She is making Toma new coat.
Tom is being made a new coat.
A new coat is being made for Tom.
6.用了现在进行时的句子由主动语态变为被动语态后,原来充当主语的名/代词(特别是人称代词)在一般情况下可以省略掉,如果有必要强调时可用by表示,常放在句子后面.例如：
They are adding new functions to the phones.
New functions are being added to the phones(by them).
Scientists are studying the life of the milu deer at present.
The life of the milu deer is being studied at present by scientists.
7.当用了现在进行时的句子由主动语态变为被动语态后,其否定式的构成主要把not放在谓语动词中第一个助动词(am ,are或is)后面构成,而疑问式的构成则是把句子谓语动词的第一个助动词(am,are或is)移到句子前(第一个字母要大写),然后在句子后面加上问号而成.例如：
New nature parks are being started in China.
New nature parks are not being started in China.(否定式)
Milu deer are being sent to China from Britain.
Are milu deer being sent to China from Britain?(疑问式)
如果是特殊疑问句还要在这个助词前面加上适当疑问词.例如：
Why is money being collected?
编辑本段与一般现在时区别一般现在时表示经常性动作,现在进行时表示现在或现阶段正在发生的动作.例如：
He studies hard. 他（经常）努力学习.
He is studying hard. 他（此刻或现阶段）正在努力学习.
一般现在时表示现在发生的动作,现在进行时表示眼前看得见的动作.例如：
Boats pass under the bridge. 船从桥下穿过.
The boat is passing under the bridge.
船正从桥下穿过.
编辑本段基本用法（1）表示（说话瞬间）正在进行或发生的动作.
（2）也可表示当前一段时间内的活动或现阶段正在进行的动作. （二）谓语构成：be (am/ is/ are)+v-ing （动词的现在分词）
I’m watching TV now.
They’re playing football.
（三）现在分词的构成.
（1）一般情况下在动词词尾加ing.
go→going ask →asking look→looking
（2）以不发音的e结尾的动词,去掉e加ing.
have →having take→taking make→making write→writing
（3）以一个辅音字母结尾的重读闭音节,双写最后一个字母,再加-ing.
get→getting sit→sitting put→putting run→running
swim→swimming begin→beginning shop→shopping
（四）现在进行时态的肯定式、否定式、疑问式及简略回答.
（1）肯定式：be+v-ing She is singing in the next room.
（2）否定式：be+not+v-ing The students aren’t cleaning the room.
（3）一般问句：be动词提前.
肯定答语Yes,主语+be,否定答语No,主语+be not.
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