1. i felt it my duty to him. 2. i flet it my duty him. 3. i make it a rule to get up at six. 4. i make it a rule getting up at six. 5. i found it easy to memorize the poems. 6. i found it easy memorizing the poems. 7. we consider it foolish of him to try it again. 8. we consider it foolish his trying it again. can we use the gerund instead of the to-infinitive? are they all grammatical? it seems that the to-infinitive is used more frequently.