an excellent swimmer.begin the trip.
用right now,就不能用完成时,可以说 I am an excellent swimmer .
prepare既可作及物动词,也可作不及物动词,prepare to do sth和 be prepared to do sth都可以
an excellent swimmer.begin the trip.
用right now,就不能用完成时,可以说 I am an excellent swimmer .
prepare既可作及物动词,也可作不及物动词,prepare to do sth和 be prepared to do sth都可以