A verb with a modal meaning and an infinitive or a gerund
Verbs and expressions used in the predicate of sentences containing the Subjective Infinitive Construction (Complex Subject)
A modal verb and an infinitive
Modal expressions: to be + Infinitive, to have + Infinitive
Modal expressions and an infinitive
Never mind who told me. I happen to know his car was seen here yesterday afternoon. (Du Maurier)
Baring had been obliged to forego making friends. (Wilson)
We intend going to Switzerland, and climbing Mount Blanc. (Ch. Bronte)
I have to work for my living. (Jerome)
"You should answer that question," he said to Rachel. (Collins)