为什么She couldn't wait to open them just now.中的open不用过去式为什么句子中第一个动词用了过去式,后面的动词就不用过去式了?

couldn't wait to she couldn't find her 为什么She couldn't wait to open them just now.中的open不用过去式为什么句子中第一个动词用了过去式,后面的动词就不用过去式了? She said the present was so wonderful that she couldn't wait ___ the present boxA.openB.to open C.opening 翻译：I couldn't wait to to leave 明天考试急!can't wait to do能不能说couldn't wait to do She couldn′t help crying when she heard the bad news couldn′t help 后为什么要加动名词? she couldn't read or write she couldn't work( )the last question She couldn't see or hear a____ she couldn't remember anymore翻译 Being asked to answer the quenstion ,she couldn't refuse 为什么要加Being She asked the teather many s____questions and the teacher couldn't answer.填什么为什么 He couldn't wait 【 】(run) to his mom.填什么?wait加动词什么形式? She couldn't find her bag.It wasn’t （there）.在此为什么不是用theres?不对是theirs。She couldn't find her bag。It wasn’t （there）。在此为什么不是用theirs？ She doesn't know whether to go or wait.为什么前面用的是to go,后面却用wait而不加to呢?原题是She doesn't know whether ______(go) or wait.go,但是为什么? She was so excited that she couldn't __(speak) Mary said they couldn't come on time,( 为什么空格里填的是didn't she