Hi,<br/><br/>Are these expressions [chase/run after/go after/pursue] correct and interchangeable in the examples? Is there any subtle difference between them?<br/><br/>1.The police are chasing/chasing after/running after/going after/pursuing an escaped prisoner.<br/><br/>2.Chase/Chase after/Go after/Run after/Pursue Ann and ask her to get some eggs while she's at the shops<br/><br/>3.The boys are playing frisbee in the park. One of the boys is chasing/chasing after/pursuing/running after/going after a frisbee.<br/><br/>Thank you very much for your help.