3) They/to play/chess/at 6 o'clock/yesterday. 4) I/to walk/the dog/at 8 o'clock/yesterday.
5) He/to wash/the car/at 3 o'clock/yesterday.
6) The children/to swim/in the pool/at 4 o'clock/yesterday. як написати правильно​

3  They were playing chess at 6 o´clock yesterday.4. I was walking the dog at 8 o`clock yesterday.5. He was washing the car at 3 o`clock yesterday.6  The children were swimming in the pool at 4 o`clock yesterday.