make sb doing sth 让某人一直做某事不是make sb do 吗？make sb do 使某人做某事make sb doing sth 让某人一直做某事是不是还等于 keep sb from dong sth?keep sb from dong sth?阻止某人做某事There was no ticket to leave,I felt very disappointed.为什么用to leave？麻烦了。。There was no ticket to leave表示对ticket的补充说明为什么用to leave 而不是leaving或者其他形式,它做的是什么成分，或者是什么句型结构可以参考 I have something to eat