句子中be able to do 是谓语 be able to 是情态动词,与后面的动词一起构成谓语。 如: 1.He is able to swim . (主谓结构) ( 谓语:is able to swim) 他会游泳。 2. He is able to speak English . (主谓宾结构) ( 谓语:is able to speak) 他会说英语。 拓展: be able to +动词原形,根据句意可用于不同的时态。 如: 1. She will be able to arrive here tomorrow morning . 她明天早上能到达这里。 2. Jim was able to swim when he was three years old . 吉姆三岁时会游泳。
be able to do为谓语动词 如( be able to sit/love/ hate)。 谓语也就是谓语动词。 简单的例子: I love you. “Love” 为谓语, I 是主语, you是宾语。 -- 套入be able to do 句子里为 : I am able to love you. LOVE 和BE ABLE TO LOVE 都是谓语动词, 所以be able to do 才是谓语。望小主采纳!!!!!!
第2个回答 2016-08-24
be able to do是谓语,be 前面是主语撒,do后面跟宾语撒,所以 be able to do只能是谓语,谓语是说明主语的状态,身份,地位,性质等,之类的东东。。。 。。。
第3个回答 2016-07-26
be able to 通常被看作情态动词,的意思与 can 相同,所以可以把 be able to 看作情态动词,其后面的动词是谓语.