I have some letters to be typed.
....letters to be typed= lettters that should be typed by me or someone else.
letteres 与 type:动宾关系,即,被动关系;我们说:type letters, 而不是:letters type.
I will have Tom type some letters for me.
...Tom type some letters... = Tom will type some letters...
Tom 与 type:主谓关系,即,主动关系;我们说:Tom type letters, 而不是:letters type Tom.
Look at the building being put up over there. It will be a new school.
... building being built...= building that is being built by workers...
building与 being put up:动宾关系,即,被动关系;我们说:put up=build a building , 而不是:building put up.
I saw Jack entering the teacher's office.
...Jack entering the teacher's office. = Jack entered the teacher's office.
Jack 与 entering :主谓关系,即,主动关系;我们说, Jack entered ..., 而不是:enter Jack.
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