help,open的过去分词是什么?是before sb do sth.还是before sb doing sth...
help,open的过去分词是什么?是before sb do sth.还是before sb doing sth...
before sb doing还是do sth
help的用法help sb.doing sth还是help sb.to do sth
help sb with sth,help sb for doing sth和help sb do sth 的区别?
help sb.do sth.和 help sb.doing sth.的区别是什么
help sb do sth help sb doing sth help sb to do sth help sb w
help sb doing sth和help sb to do sth
help sb in doing sth &help sb to do sth
before什么时候加doing sth./sb.do sth.什么时候before后加一般过去时的句子或过去完成时的句
help sb是加to do sth还是doing sth还是do?
make的词组是make sb do sth 还是make sb to sth还是make sb doing sth
before doing sth还是do sth