1、把动词变成现在分词形式易出错。例：
（1）误：They are swiming (swim) .
正：They are swimming (swim).
（2）误：Jenny is plaiing (play) football.
正：Jenny is playing (play) football.
解析：A、动词变现在分词可有如下口诀:一般-ing；哑e先去e；重闭单辅先双写；-ie结尾y来替。
B、动词现在分词的变化规则要与名词变复数、动词变现单三等规则区分开来。
2、谓语部分的构成不完整：丢掉be动词，或忘记把动词变成现在分词。例：
（1）误：Look! Two children flying (fly) a kite in the park.
正：Look！Two children are flying (fly) a kite in the park.
（2）误：Li Ming isnt read ( not read) a book in bed now.
正：Li Ming isnt reading ( not read) a book in bed now.
解析：现在进行时的谓语部分的构成是be+现在分词，二者缺一不可，这一点必须要牢记。
3、对动词或动词词组提问时，丢掉代动词doing。例：
The students are singing in the room.(对划线部分提问)
误：What are the students in the room?
正：What are the students doing in the room?
解析：现在进行时态中对动作提问可记住此句式What +be +主语+doing+其它?或简写为What......doing......? 句式。
4、现在进行时态的谓语部分是并列结构时，容易忽视第二个以及第二个以后的动词用现在分词形式。例：
孩子们在跑还是在跳？
误：Are the children running or jump?
正：Are the children running or jumping?
解析: or连接的是两个并列成分，动词形式须一致。