实前BE后，这样记简单

also放be动词与情态动词后，实意动词前（类似有not)，疑问句放人后(not不是）。
He is also a student.
Is he also a student?情态动词一样(略）。
He also does it. 
Does he also do it?

also的位置
also用于实义动词之前  
▲also用于实义动词之前 
They also agree with me. 
他们也同意我的看法。 
I also began to be interested in crickets.
 我也开始对板球运动感到兴趣。
also用于be动词之后 
 ▲also用于be动词之后 
I was also there. 
我也在那儿。 
He is also an American. 
他也是美国人。
also用于第一个助动词之后 
 ▲also用于第一个助动词之后 
His sister has also gone to town.
 他的妹妹也到镇里去了。 
The leisure center has also proved uneconomic. 
休闲中心业已证明利润不大。 
also有时放在句首  
▲also有时放在句子的最前 
Also, some students were tempted to add written comment of their own throughout the paper. 
一些学生也冒险通过论文写出他们自己的评论。
 I thought it was the perfect answer. 
Also, Tony and I had never done a historical subject. 
我认为它是完美的答案。而且，托尼和我从没有作过历史科目。
 also不能放在句末  
▲注意：also一定不能放在句子的最后。 
参见：《柯林斯COBUILD英语用法词典》 
<><><> 
但是 赵振才教授在他的《英语常见问题解答大词典》中列举了美国英语关于also放在句末的例子。 
I must buy some bread also.
 我还必须买一些面包。
 They know him and I know him also.
 参见：赵振才《英语常见问题解答大词典》 
<><><> The son had gone also.
 儿子也走了。
 参见：张道真《现代英语用法词典》 
<><><> 

also和too的意思差不多，都表示“也”，also多放在主要动词前面，或系动词be的后面，有时也可以放在其它位置。 
They also agreed with me. 他们也同意我的意见。 
I was also there. 我也在那里。 
有时也可以放在整个谓语前面，如 
I also am writing a short story.我也在写一篇短篇小说。 
有时也可以放在句末，甚至句首，如： 
Her son had gone also.她儿子也去了。 
Also,Peter had taken that course.彼得也选过那个课。 
注意，在否定句中，不能用also,而要用either,如： 
Helen isn't here today.Nancy isn't here either.海伦今天不在这里，南希今天也不在这里。