i have waited for two hours 的同意句是什么

The concert began two hours 的同意句是什么 hours,for,volleyball,I,two,have,usually(.)连词成句 I have been down for two hours.改为同义句 I have waited for them （since three hours ago）.对括号里的内容提问 请标出下列句中重读的单词 I have an art lesson for two hours 对划线部分提问：I waited for my mother (for two hours )last night. at the school gate,they,have waited,since two hours ago,for I spent two hours cleaning my house.同意句 I waited for her for two hours yesterday.句子中第二个for可以换成别的介词吗? I have waited for you since three hours那里错啦 have I art lesson an for hours two that after 连词成句 连词成句：i two class hours after have volleyball for