sb be always do 或doing
always see sb doing/do sth
be always 后什么情况加doing还是do或does
always do 与be always doing的区别
be difificult for sb do 还是doing还是to do
英语翻译allow sb.to do sth.ask sb.to do sth.be busy doing sth.be
ask sb to do sth be afraid of doing be busy doing be late fo
英语中关系There be sb do/doing sth 的
是be up to sb to do还是doing?
leave sb doing /leave sb to do /leave sb to be done
there be sb doing
see sb do/doing
find sb do/doing