分為主語(yǔ)補(bǔ)足語(yǔ)和賓語(yǔ)補(bǔ)足語(yǔ).起到補(bǔ)充說(shuō)明的作用.如 Teachers usually try to make their classes interesting. 這里的 their classes 做make 的賓語(yǔ),interesting 是補(bǔ)充說(shuō)明 classes的.又如,We call him Mr. Big. 這里的 him 是賓語(yǔ),Mr. Big 是him的補(bǔ)語(yǔ),補(bǔ)充說(shuō)明起屬性、特征等的.注意與雙賓語(yǔ)相區(qū)分,He gave her some candies. her 和candies之間沒(méi)有任何補(bǔ)充說(shuō)明關(guān)系,兩個(gè)都是gave的賓語(yǔ).主動(dòng)語(yǔ)態(tài)的賓語(yǔ)補(bǔ)足語(yǔ)變?yōu)楸粍?dòng)語(yǔ)態(tài)時(shí)則為主語(yǔ)補(bǔ)足語(yǔ)。如 People found a little boy injured in the accident.句中的 injured 為賓補(bǔ)，補(bǔ)充說(shuō)明 a little boy. 變被動(dòng)：A little boy was found injured in the accident. injured 還是補(bǔ)充說(shuō)明 a little boy的, 但現(xiàn)在則為主補(bǔ)了。被動(dòng)語(yǔ)態(tài)的主補(bǔ)與主動(dòng)語(yǔ)態(tài)的賓補(bǔ)密切相關(guān)。