1.leave sb to do ; leave sb do: which one is correct?? leave sb to do
2. great numbers of + countable and plural noun: is this expression correct??在lzm那本书里面一会说对一会说错。还有quantities of 他里面也一会说可数不可数都可以,一会说只能是可数 quantities of 不用于人。
3. because 不能引导名词性从句是什么意思??能否举例说明一下?? The reason is because。