翻译下列句子（用动词不定式形式）1,我有个重要会议要参加.2,他什么也没说,只是哭.3,如何处理这些垃圾是个问题.4,对

翻译下列句子（用动词不定式形式）1,我有个重要会议要参加.2,他什么也没说,只是哭.3,如何处理这些垃圾是个问题.4,对他们来说,掌握一门外语很重要.5,我记得是把自行车放在大楼前面可现在无论如何也找不到了

1 i have to take part in an important conference.
2 he said nothing but just cried.
3 it is a problem to deal with the rubbish.
4 it is important for them to handle a foreign language.
5 i remembered putting the bike before the building but i could not find it now.

对的，就是这个意思