The part of sentence 'have several functions' is correct and can be used in written English.
You can use this phrase when you want to indicate that something has multiple purposes. For example: "This computer program can be used for many tasks; it has several functions."
"Awards shows have several functions: to reward excellence, but also to show the many forms excellence can occupy," says Mary McNamara, the Pulitzer prize-winning critic.
In their nonpolitical role, interest groups may have several functions, but, when they become enmeshed in the political sphere, they have one overriding goal: to gain favourable outcomes from public policy decisions.
Baroness Tonge, whose criticism of Israel led to her resignation from the Liberal Democrats two years ago, said yesterday: "Demonstrations like this have several functions: for the people of Gaza and the West Bank to know they are not alone, and hopefully to persuade our politicians that they simply have to start listening to the people".
These snorts may have several functions, says Dr Jakob Bro-Jorgensen of the University of Liverpool in the UK.
Phantasmata have several functions paralleling those ascribed to imagery by modern folk psychology (and some scientific psychology).
Blowout preventers have several functions, but the most important is the ability to prevent large blowouts of hydrocarbons from the well (Østby 2008).
Lactic acid produced by the starter culture organisms has several functions.
Their silence has several functions, since wonder can mean uncertainty as well as awe, and through the quiet, Marina's deeper confusions are about herself.
This part of the brain has several functions, Dr. Cohen said, including the task of detecting errors and conflict in the flow of information being processed automatically.
Scenario literature shows that consistency has several functions.
Government has several functions – including creating the space for civic engagement and democratic deepening.
