Question

Change the narration the teacher said ，students，the earth is spherical in shape

Answer 1

Indirect/Reported Speech refers to a dialogue being told to a third person/reporting what happened to a third person.

Example: Monroe said, "I love my mom." (Direct)

                Monroe said that she loved her mom. (Indirect)

In the above example, when writing in indirect/reported form, the sentence changes according to its tense. Also, modifications regarding certain words like 'this' changes to 'that', 'tomorrow' changes to 'the next day', 'will' changes to 'would', 'can' changes to 'could' and many other words have to be made. Also, if the sentence contains an interrogation, then 'said' changes to 'asked'. Punctuation marks other than a full stop (.) cannot be used in indirect/reported speech.

The teacher said, "Students, the Earth is spherical in shape." (Direct)

The teacher told the students that the Earth is spherical in shape. (Indirect)

Answer 2

This is Direct:-

The teacher said,students,the earth is spherical in shape

This is indirect:-

The teacher told the students that the Earth is spherical in shape.