Chapter 6 introduces the future and imperfect of sum, the forms of the verb possum, which means "to be able," and the complementary infinitive.
The complementary infinitive is any infinitive that's used to make a complete phrase with another verb. For example, if you say "I am able to..." you need to be able to do something, and that something is expressed with the infinitive form of another verb: possum te iuvare, "I am able to help you."
The future and imperfect of sum are formed with the stem er-, the vowel i (future) or a (imperfect), plus the usual personal endings.
The forms of possum, "to be able," basically consist of the forms of sum, esse plus the prefix pot-, which means "able." Pot- turns into pos- whenever the form of sum, esse happens to start with an s-.
If you have questions about tomorrow's homework, please leave them as a comment on this post. Thanks!
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