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Please help me to correct them.

Last Tuesday morning, when the bell rang, it was recess Emotion: time. Ali was the first pupil who rushed (from the classroom) towards the canteen as fast as lightning. He was very hungry as he did not have his breafast yet.

As he reached the canteen, he did not see a boy looking for an empty seat. Unluckily, he accidentally ran into a boy (who was) holding a bowl of hot noodle soup. They both fell onto / to / on the floor. The boy felt in pain.

His hot soup dropped out of / dropped from his hands to / on the floor. The boy was sad and cried loudly. Many pupils gathered around them (to see what happpened / what had happened). Ali quickly held the boy up and apologized to him. After that, he bought another bowl of soup for him.

When the second bell rang, they all rushed to the class. Ali was really a careless pupuil.
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I have underlined problems:

Last Tuesday morning, whenthe bell rang, it was recess Emotion: time. Ali was the first pupil who rushed (from the classroom) towards the canteen as fast as lightning. He was very hungry as hedid not have his breafast yet.

As he reached the canteen, he did not see a boy looking for an empty seat. Unluckily, he accidentally ran into a boy (who was) holding a bowl of hot noodle soup. They both fell onto / to / on the floor. The boy felt in pain.

His hot soup dropped out of / dropped from his hands to / on the floor. The boy was sad and cried loudly. Many pupils gathered around them (to see what happpened / what had happened). Ali quickly held the boy up and apologized to him. After that, he bought another bowl of soup for him.
When the second bell rang, they all rushed to the class. Ali was really a careless pupuil.
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I try:

Last Tuesday morning, whilethe bell rang, it was recess Emotion: time. Ali was the first pupil who rushed (from the classroom) towards the canteen as fast as lightning. He was very hungry as he hadnot have his breafast yet.

As he reached the canteen, he did not see a boy looking for an empty seat. Unluckily, he accidentally ran into the boy (who was) holding a bowl of hot noodle soup. They both fell onto / to / on the floor. The boy felt in pain.

His hot soup dropped out of / dropped from his hands to / on the floor. The boy was sad and cried loudly. Many pupils gathered around them (to see what happpened / what had happened). Ali quickly held up the boy and apologized to him. After that, he bought another bowl of soup for him.

When the second bell rang, they all rushed to the class. Ali was really a careless pupil.
onto / -- This means 'delete'.

felt in pain -- This means 'change it'.

Last Tuesday morning whenthe bell rang, it was recess Emotion: time. Ali was the first pupil who rushed (from the classroom) towards the canteen as fast as lightning. He was very hungry as he had nothad his breafast yet.

As he reached the canteen, he did not see a boy looking for an empty seat. Unluckily, he accidentally ran into the boy, who was holding a bowl of hot noodle soup. They both fell onto / to / on the floor. The boy felt in pain.

His hot soup dropped out of / dropped from his hands to / on the floor. The boy was sad and cried loudly. Many pupils gathered around them (to see what happpened / what had happened). Ali quickly held up the boy and apologized to him. After that, he bought another bowl of soup for him.
When the second bell rang, they all rushed to the class. Ali was really a careless pupil.
I try again:

Last Tuesday morning whenthe bell rang, it was recess Emotion: time. Ali was the first pupil who rushed (from the classroom) towards the canteen as fast as lightning. He was very hungry as he had nothad his breakfast yet.

As he reached the canteen, he did not see a boy looking for an empty seat. Unluckily, he accidentally ran into the boy, who was holding a bowl of hot noodle soup. They both fell onto / to / on the floor. The boy felt painful.

His hot soup dropped out of / dropped from his hands to / on the floor. The boy was sad and cried loudly. Many pupils gathered around them (to see what happpened / what had happened). Ali quickly lifted up the boy and apologized to him. After that, he bought another bowl of soup for him.

When the second bell rang, they all rushed to the class. Ali was really a careless pupil.
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You have not fixed several problems that I indicated. Please re-read my note above about deletions.

Last Tuesday morning when the bell rang, it was recess Emotion: time. Ali was the first pupil who rushed (from the classroom) towards the canteen as fast as lightning. He was very hungry as he had not had his breakfast yet.

As he reached the canteen, he did not see a boy looking for an empty seat. Unluckily, he accidentally ran into the boy, who was holding a bowl of hot noodle soup. They both fell onto / to / on the floor. The boy was hurt.

His hot soup dropped out of / dropped from his hands to / on the floor. The boy was sad and cried loudly. Many pupils gathered around them (to see what happpened / what had happened). Ali quickly lifted up the boy and apologized to him. After that, he bought another bowl of soup for him.
When the second bell rang, they all rushed to the class. Ali was really a careless pupil.