摘要： Eugene's never willing to alter(change) any of his opinion. it's no use arguing(争论) with him // 固定 missing a bus means (+doing 意味着)waitting for anothe 阅读全文

摘要： 主语/宾语 介宾语 doing 可 可 to do 可 不可 done 不可 不可 done 不能做主语 宾语 只有doing 才能做介词的宾语 时态(和谓语动词比较) 介宾语 doing being done baving been done to do to be done to have be 阅读全文