1) 当直接宾语是人称代词 (it, them等) 时。例如: This schoolbag is Li Lei's. Pleasegive it to him. 2) 当强调间接宾语时。例如: Grandma cooks lunch for us everyday. 3) 当间接宾语比直接宾语长一些时。例如: Lucy gave 5 yuan to that old womanjust now. 3...