sb have been training sb have been trained 哪个对?

sb have been training sb have been trained 哪个对? the buildings have been designed by sb. 语法检查 have done sth.than sb.have ever been have sb done和have been doing有么? have been dead和have been died哪个对 have sb I have been very busy training for my next competition where have you been 和where have you been to 哪个对?有什么不同? i have been to Shanghai?和i have been Shanghai?哪个对?请详解. for +时间段 at+时间点 have been to plan to do sth stay with sb com It is never too late to be what you might have been sb. have been to 与was sb at两者的区别v?