the second verb must be either an infinitive with 'to' such as 'to do', 'to make', 'to go' etc. or an -ing form such as 'doing', 'making', 'going'. In this episode of The Flatmates, the police ...

There are several rules to follow when changing a verb into the verbal noun - but one rule all verbal nouns follow ... how verbal nouns in English end in -ing.