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Поставьте глаголы в тексте в отрицательную форму при помощи отрицательной частицы not
Например:was-wasn't

History and future of the Internet he Internet technology was created by Vinton cerf in early 1973 as part of a project headed by Robert Kahn and conducted by the Advanced Pr Research Agency, part of the United States Department of Defense) Later Cerf made many efforts to build and standardize the Internet An 10g4 the technology and the network were turned over to the private sector and to government scientific agencies for further development (The growth has continued exponentially Service provider companies that make "gateways" to the Internet available to home and business user enter the market in ever increasing numbers.

Later Cerf hasn't made many

в том предложении шло прошедшее время

Да-да, я поняла ошибки в моем тексте.

поэтому надо было написать Later Cerf didn't make many 

Да, Вы правы.

History and future of the Internet he Internet technology wasn't created by Vinton cerf in early 1973 as part of a project headed by Robert Kahn and wasn't conducted by the Advanced Pr Research Agency, part of the United States Department of Defense) Later Cerf didn't make many efforts to build and standardize the Internet. An 10g4 the technology and the network weren't turned over to the private sector and weren't  government scientific agencies for further development (The growth hasn't continued exponentially Service provider companies that make "gateways" to the Internet available to home and business user hasn't entered the market in ever increasing numbers.