当to作为动词不定式的标志时，后面加动词原形，作为介词的词性时，用v—ing的形式。
例句：
Whos going to break it to her?
由谁来把这事告诉她呢？
Its a constant struggle to try to keep them up to par.
要使他们达到标准是一场持久战。
She went to her room to unpack。
她回到自己的卧室打开行李取出衣物。
Rice aspired to go to college。
赖斯渴望上大学。
I wish to speak to the manager。
我想跟经理说话。
It pleased him to talk to her。
和她谈话让他高兴。
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