1.She is playing sports. is,现在进行时，动词加ing
2.What is Mr Chen doing? is,现在进行时，动词加ing
3.Can you palnt trees? can是情态动词，情态动词后面动词原形
4.Look！Jack is drawing pictures. look表示现在进行时，动词加ing
5.Please clean the classroom.please，是祈使句
6.I sometimes go hiking on weekends.sometimes是一般现在时
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