椅子在桌子的前面\The chair is at the front of the desk./ The chair is before the desk.
他昨天在彈鋼琴 He was playing the piano yesterday.
我現(xiàn)在在掃地\I am cleaning the floor now.
他明天要去加拿大\He will go to Canada tomorrow.
球在床下面\ The ball is under the bed.
他們昨天在跑步\They were running yesterday.
紙是由木頭制造\ Paper is made of wood.
我們下星期要去參觀博物館\ We will (go to) visit the museum next week.
他們現(xiàn)在在農(nóng)田工作\ They are working in the farm now.
他在看電視\ He is watching TV.
我們現(xiàn)在在上課\ We are having class now.