Answer:-

• I said my mom that I was unable to help her due to my studies.
• She said that she will leave for her flight now.
• He says that he'll come early.

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More About:-

• Direct speech in represented  between a pair of inverted commas while indirect speech is reporting of someone's statement afterwards.

• Direct speech can be used in every tense in the statement. we can use it to describe something in the present tense i.e. something that is happening at the present moment.
• Example- Meena says, "I am afraid of insects".

• Indirect speech is used to report what someone may have said, and so it is always used in the past tense. Instead of using inverted commas as in direct speech, we use the word “that” to introduce the statement.
• Example:- Meena said that she is afraid of insects.

Changing direct speech to indirect speech:-

• The tense if the verb is changed.
• Use reporting verbs such as said, thought, asked followed by that.
• Remove the punctuations.