孕妇sg比重1.005偏低:Help sb.(to)do …表示“帮助某人干…”，

Help sb.(to)do …表示“帮助某人干…”， help sb. to do sh. help sb. do sth还是help sb to do sth? help sb. do sth还是help sb to do sth? 是help sb. do help还是sb. to do？ help to do、help do、help sb to do 、help sb do这几个句型有什么区别？最好举例说明 help sb to do sth和help sb do sth请问什么意思 want to sb to do help sb. to do sth这个to是可以省略,那么make/watch/let/please... sb. do sth这个to 是不是必须省略? help to do 用法