时态4 现在进行时

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定义:表示此时此刻正在进行的动作或事情;
构成:主语+be+v.ing〔现在分词〕形式
be 要根据人称代词和名词的单复数不同,而分别使用am/is/are,即:I am/he/she/it 包括单数名词和不可数名词用is,you/we/they 包括复数名词用are.
变化规则:(1)直接在谓语动词后加ing. 例如:going, starting, working,looking.
(2)去掉词尾不发音的e,再加ing. 例如leaving,making,coming,writing.
注意:如果单词结尾的e发音,则不能去掉,也直接加ing. 例如:see -seeing/agree - agreeing .
另外,有少数动词比较特殊,请用心记住:例如:lie - lying/die - dying/tie - tying/picnic - picnicking.
(3) 对于重读闭音节词,双写末尾辅音字母再加ing. 例如:sitting, beginning,getting,putting. run - running stopping cutting controlling
使用场合:
1、now, at the moment (此刻、现在)等时Linda's brother is watching TV in his
bedroom now
2、these days, this week, this month等时,如果句子所要表达的意义是在这一
阶段正在发生的事These days we are helping the farmers work on the farm
They're having a test this week
3、Look, Listen, Can't you see? 等暗示词时,说明后面谓语动词的动作正在发
生Look! Maria and Tom are dancing under the tree
4、有些动词从结构来看是现在进行时,但却是表示将要发生的事,而不表示动作现
在正在进行。

这些动词往往是一些表示位置移动变化的动词,如:go , come ,
leave , fly , move, start, begin , arrive, , stay, return等。

Next month
my family is moving to Beijing.
5、当其与always、forever、continually、constantly 等副词连用时表示重
复的动作,而这种动作可能使人不满,厌倦或满意The students are making
progress constantly。