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Can I say,

Ali was a mischievous boy. He always played pranks (on his friends). When their class teacher went out, the class monitor asked him to behave well / himself, but he did not want to listen (to).
Some of them standing on the chair while others shouting nosily / loudly.
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.
Ali was a mischievous boy. He always played pranks (on his friends). When their teacher went out, the class monitor asked him to behave well / himself, but he did not want to listen. Some of the students stood on their chairs while others shouted noisily / loudly.
.
Comments  
u r writing this paragraph in past tense....wht i think u should write the whole paragraph in present tense...........n its should b;
Ali is a mischievous boy.He always plays pranks(on his freinds).when their teacher goes out,the class monitor asks him to behave well/himself,but he does not want to listen.some of the students stands on their chairs while others shouts noisily/loudly..
This wht i think it should b ....may b its is wrong or not upto ur mark.....but a suggestion ...

bye t|c