Some auxiliary verbs need to be followed by only an infinitive, not _te_ \+ infinitive. We see the same in English:
We say "we can stay", not "we can _to_ stay."
The auxiliary verbs that do not require 'te' are the [modal verbs](#/lesson/Verbs.Au15) and the [transitive verbs](#/lesson/Verbs.Au16). We will discuss them on the next two pages.