options: m : i see . the outside lines of the basketball court are for singles . m : ok. the outside lines are for doubles . i will remember that . m : tennis can only be played in doubles . and the outside lines are for doubles . m : i know . the outside lines are for new learners of the basketball .
article: m : kathy , it seems you 're having a lot of fun playing tennis . f : would you like to learn ? m : yes , how do you play ? f : tennis can be played in singles or doubles . look , there , the outside lines are for doubles and the inside lines are for singles .