Wh Questions Preparation 20.Sound waves travel through the air. (PS) సౌండ్ వేవ్స్ ట్రావెల్ త్రూ ద ఎయిర్. ధ్వని…
SIMPLE PRESENT PRESENT CONTINUOUS PRESENT PERFECT PRESENT PERFECT CONTINUOUS SIMPLE PAST PAST CONTINUOUS PAST…
SIMPLE PRESENT PRESENT CONTINUOUS PRESENT PERFECT PRESENT PERFECT CONTINUOUS SIMPLE PAST PAST CONTINUOUS PAST PERFECT…