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 ...

However, if we are talking about the purpose of an object or an action, we normally use the for + verb-ing pattern. Note that this pattern commonly answers the question: What are they (used ...