Сделать! нужно сегодня! ask your friend to do something (the words will help you)and let him/her say what he/she has done. examples: open the door! i have open the door. wash up, clean your teeth, water the flowers, visit your granny, lock the door, clean the carpet, wash the floor, count the numbers.

Wash up your face! I have washed it.
Clean your teeth! I have cleaned them.
Water the flowers, please! I have already watered them.
Please, visit your granny! I have visited her 
Lock the door! I have already locked it.
Clean the cerpet! I have cleaned it!
Wash the floor! I have washed it.
Count the numbers! I have counted them.