Model: 1) to discuss –to be discussed; to be discussing; to have discussed; to have been
discussed; to have been discussing.
2) to sleep –to be sleeping; to have slept; to have been sleeping.
To describe, to explain, to smile, to jump, to cross, to read, to walk, to call,
to keep, to have, to bring, to see, to wait.

Exercise 2. Give all the possible forms of the following Infinitives.
To do, to study, to live, to sit, to lie, to raise, to set, to sell, to leave, to go,
to inform, to like, to write, to run, to make.​

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