The Forms of the Gerund

The Indefinite forms of the Gerund denote simultaneous action and Perfect forms prior action to that of the main verb:

He likes watching television.

She dislikes being criticized.

He admitted having told lies.

He denied having been informed about the time of the meeting.

NOTE: After the verbs excuse, forgive, remember, thank etc. and after the prepositions on (upon), after, without the Gerund Indefinite may be used to denote a prior action:

Excuse my interrupting you.

After confessing to her he was very much relieved.