help sb with sth是什么意思
leave sb. to do sth.什么意思
help sb do sth造句
keep sb from doing sth是什么意思
it takes sb.+时间+to do sth.造句
signal to sb.to do sth.造句
help sb with sth
tell sb not to do sth
lead sb to do sth
get sb to do sth