In Direct Speech, the original words must be exact to what the person had said, therefore, no change is made to the verbs and tense as well. The words said are also enclosed in quotation marks.
In Indirect Speech, some changes are made to the original words of the person. The tense and pronouns might also be changed since the words have been said in the past. The words are also not enclosed in quotation marks.
Indirect Speech is also referred to as Reported Speech.
Source : Studyandexam.com
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There are also 4 other PDF booklets in the series. You'll find them here.
Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)
Experiment #5 - Forces (Interactions)