你知道明天会下雨吗?
Do you ___know if it will rain tomorrow?
你认识那位穿红裙子的女士吗?
Do you ___know the lady in the red dress?
他能一眼认出真正的古董。
He can ___recognize a genuine antique at first glance.
她知道怎么修理自行车。
She ___knows how to fix a bicycle.
我知道明天会下雨,因为我看了天气预报。
I ___know it will rain tomorrow because I checked the weather forecast.