【一个英语问题】as well as 后面如果加动词是加什么形式啊?我的一本参考书上说是加动名词,而在我订的英语报纸中有

【一个英语问题】
as well as 后面如果加动词是加什么形式啊?
我的一本参考书上说是加动名词,而在我订的英语报纸中有加动词原形的,还有我的一份听力训练的听力材料里也是加动词原形.
as不是介词吗?后面跟的动词为什么可以是动词原形不是动名词?
as well as 后的动词到底是什么形式啊?还是两种都行?

as well as 前后都接动词时,前后动词时态、形式要一致.
He publishes as well as prints his own books.
We are repairing the roof as well as painting the walls.
位于句首后接动词时,接动句词.
As well as breaking his leg,he hurt his arm.
或做“除了...还...”即addition to讲时也接动名词.
She sings as well as playing the piano.她不但会弹钢琴,而且会唱歌.
下面又举一些,有兴趣自己看看.
1.as well as 可连接并列的单词或短语.例如：
It is unpleasant in summer as well as in winter.
夏天不好过,冬天也不好过.
The child is lively as well as healthy.
这孩子既健康又活泼.
3.如果as well as 前面是动词不定式,那么其后的动词也是不定式,但to要省略.例如：
You cannot expect her to do the housework as well as look after the children.
你不可能叫她既照顾孩子又做家务.
4.由as well as 连接的复合主语并不影响谓语动词的数.例如：
Helen as well as I is eager to see the performance.
海伦和我一样急于要看演出.
I as well as they am ready to help you.不仅他们愿意帮助你,我也愿意帮助你.
5.as well as 连接的人称代词既可以是主格也可以是宾格,但句意不同.例如：
They have invited you as well as me.
他们邀请了我,也邀请了你.（you和me都作invited的宾语）
They have invited you as well as I.
他们和我一样都邀请了你.（they和I都作invited的主语）
6.as well as 用于肯定结构和否定结构中,其意义不同.as well as 和not搭配使用,as well as 位于not前时,两者均否定；位于not后时,否定前者,肯定后者.例如：
George,as well as his brother,has gone abroad.
乔治和他兄弟一样都出国了.
George hasn”t gone abroad as well as his brother.
乔治并没有和他兄弟一样出国去.（他兄弟一人出国）
George,as well as his brother,hasn”t gone abroad.
乔治和他兄弟都没有出国.
7.as well as 在意义上通常强调前者,而not only …but also在意义上则强调后者.例如：
He”s got a car as well as a motorbike.
他不但有一辆摩托车,而且有一辆小汽车.
（= He”s got not only a motorbike but also a car.）
8.注意as well as 有时会引起歧义句.例如：
He can speak french as well as English.
（1）他会说英语,也会说法语.
（2）他说法语能说得像英语一样好.（…as well as he speaks English）