当动词help后接不定式用作宾语或宾语补足语时，该不定式既可以不带to，也可以不带to，即用于help (to) do sth或help sb (to) do sth。如：
I helped (to) wash the car. 我帮忙洗车。
He helped (to) do the work. 他帮助做这工作。
We helped her (to) find her things. 我们帮她找东西。
I helped him (to) repair his bike. 我帮他修自行车。
但是，如果help用于被动语态，则其后不定式必须带to。如：
The boy was helped by a woman to collect his scattered coins. 那男孩由一个妇女帮他捡拾散乱一地的钱币。
另外，当不定式为否定式时，其中的to通常不宜省略。如：
How can I help my children not to worry about their exams? 我怎样才能帮助我的孩子们不为他们的考试着急呢?
注：在美国英语中help之后的不定式多不带to。在英国英语中help之后的不定式不带to时往往有帮助者参加不定式所表动作的含义，带to时则无此含义。比较：
He helped her lift the box. 他帮她抬那箱子。(“他”参加了不定式lift所表的动作)
He helped her to mount the bicycle. 他扶她上了自行车。(“他”不参加不定式to mount所表的动作)
help (sb) (with sth) | help (sb) (in doing sth)
I need contacts that could help in finding a job.
我需要能帮我找到工作的社会关系。
Jo will help us with some of the organization.
乔将帮我们做一部分组织工作。
The college's aim is to help students (to) achieve their aspirations.
大学的目标是帮助学生实现他们的抱负。
This charity aims to help people (to) help themselves.
这个慈善机构的宗旨是帮助人们自力更生。
She helped (to) organize the party.
她协助筹备了晚会。
sb can (not) help (doing) sth
sb can not help but do sth
某人忍不住（或无法抑制）做某事；不可能避免某事
I can't help thinking he knows more than he has told us.
我总觉得他没把他知道的事全告诉我们。
I can't help feeling sorry for the poor man...
我不禁为这个可怜的男人感到难过。
I can't help feeling that this may just be another of her schemes...
我不免觉得这可能只是她的又一个诡计。
She couldn't help but wonder what he was thinking.
她不禁琢磨着他在想些什么。
It couldn't be helped (= there was no way of avoiding it and we must accept it) .
这是不可避免的。
I always end up having an argument with her, I don't know why, I just can't help it .
我总是和她意见不合，闹得不欢而散，我不知道为什么，我就是忍不住。
I couldn't help it if the bus was late (= it wasn't my fault) .
公共汽车晚点了，我没办法。
She burst out laughing─she couldn't help herself (= couldn't stop herself) .
她突然大笑起来——她控制不住自己。
He has helped to raise a lot of money
他帮着筹集了很多钱。
He tries to help people with problems, but firmly believes they should do more to help themselves.
他尽力帮助有困难的人，但仍坚信他们应该更加努力自救。
help yourself/sb (to sth)
为（自己 / 某人）取用 ; 偷窃
If you want another drink, just help yourself.
你要是想再喝一杯就请自便。
Can I help you to some more salad?
再给你来点色拉好吗？
He'd been helping himself to the money in the cash register.
他一直在偷现金出纳机中的钱。
Has somebody helped himself to some film star's diamonds?
有人偷了某个影星的钻石了吗？
Can I be of help to you?
我能帮上你吗？
小结：
1. help (to) 帮助，帮忙
help 当动词用时，是指帮助、帮忙的意思。其后面可以接to，但通常也可省略。
help sb.to do sth.意为“帮助某人做某事”,其中,不定式符号to可以省略.
2.help (with) 帮助、帮忙
help后面还可以接with，用来表示要帮助的那件事。与help sb.(to) do sth.意思相近.
2. help yourself 请自便；窃取
3. can’t help but 忍不住
can’t help but是指控制不住、忍不住的意思。
4. sb can (not) help (doing) sth忍不住，不禁
5. with the help of sb.或 with one's help 意为“在某人的帮助下”.这里的with不可用under来代替.
