为什么用taught而不用having been taught?Taught to behave well,my sister and I respected other people,regardless of their age or color.

为什么用taught而不用having been taught?Taught to behave well,my sister and I respected other people,regardless of their age or color. 为什么用not having recieved 作句子开头而不用having not received? He is having a good time.为什么用having而不用hasing . It must be teenagers having fun 为什么这里要用having而不用to have It must be teenages having fun 这里为什么要用having 而不用to have You seem to be having some problems.中为什么用having而不用have? most people prefer having spent money to having earned it为什么用 having spent和 having earned 而不用 spending和earning having drunk some milk i have some trouble with my stomach这里为什么用having而不用have?为什么? Sorry,I have no enough money now.为什么用 have,而不用am having呢? ----Where are you teaching now?----In a university.But i taught in a high school for 8 years.后一句为什么用一般过去,而不用现在完成 He taught me how to swim.这里为什么不用teach啊,为什么用过去式啊? (Having waited)in line for half an hour ,Tom suddenly realized that he had left his wallet at home为什么不用To have waited 而用Having waited i don't remember the car having been repaired during these years 为什么 用having 而不用 has have 或者had ls this room large enough to have the meeting?这句中为什么用to have而不用having? Seating herself alone there,she memorized her happy hour.为什么要用seating而不用Having seated或seated? Told several times, he couldn't understand what I meant. 为什么用 told ,而不用having been done? what about having an English evening什么意思/为什么用having 不用原形 She didn't remember having met him before.为什么用having不用have啊