第一句：语法规定情态动词（这里是will）和助动词后面不定式省略to
第二句：为了避免重复前面的动词,后面通常省略不定式,保留to
that i took her watch是宾语从句,作宾语
i forgot 宾语是you were supposed to buy some sugar整句句子,哪来的不定式,语法关于不定式省略to就这么几条,还不懂吗
补充的没理解,你要问什么区别
不定式 省略toRober will collect us by 10 o'clock,he promise (to)i
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