Yes. Four constructive tasks on the TOEFL iBT measure your ability to use your personal experience ("personal knowledge") when developing an argument.
1. Independent speaking task #1
Remember: The constructive tasks (speaking and writing) are designed to measure your ability to speak and write (develop arguments) both subjectively (first person) and objectively (third person) This is one way the TOEFL iBT measures grammar proficiency. The reading and listening tasks are designed to test both your active vocabulary and your passive vocabulary, as well as grammar. This is another way the TOEFL iBT measures language use proficiency.
WARNING! If a TOEFL instructor (or a TOEFL online pay site) tells you not to use your personal experience on the TOEFL iBT, it is time to find another instructor.
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