这句英文是什么时态His mother has been exerting a lot of pressure on h

这句英文是什么时态His mother has been exerting a lot of pressure on h Tom has taken a lot of photographs on his holiday 这句话是什么时态 BOB has been s__ a lot of old coins in his bedroom for three a lot of attention has been paid（ ）his pronunciation,but in we have had been having a lot of rain recently 用的是什么时态 为什么这么 请问He has been waiting for his brother for a long time.是什么时态, 原句：Mr.Obama said Mr.Romney has been wrong on all of his fore his mother spent a lot of money buying clothes.（同义句转换） Has Tom been late,这是什么时态 his wife has been______a lof of pressure on him to change hi under a lot of pressure中文是什么意思 His English has been improve a lot .His English has improve