老师,this is my pen变疑问能不能用is this my pen?

可以的.
一、要将陈述句变成一般疑问句,可以遵循下列步骤：
1.看句中有没有be动词（am、is、 are、 was、 were）、助动词（do、does、did、 have、 had）或情态动词（can、must、will、may等）,如果有,将其提到句首,句末打上问号即可.
例：It was rainy yesterday.
→Was it rainy yesterday?
Tom's father can play the piano.
→Can Tom's father play the piano?
I have finished my homework.
→Have you finished your homework?
2.如果句中没有be动词、助动词或情态动词,则根据谓语动词的形式借助do的相应形式放在句首.
具体方法是：
①如果谓语动词是原形,则借do；
②如果谓语动词是一般现在时第三人称单数形式,则借does；
③如果谓语动词是过去式,则借did.
需要注意的是,借does或did后,原句的谓语动词要变回原形.
例：They go to school by bike.
→Do they go to school by bike?
Bill gets up at 6:30 every day.
→Does bill gets up at 6:30 every day?
The students saw a film yesterday.
→Did the students see a film yesterday?
二、陈述句变一般疑问句应注意的事项
陈述句变成一般疑问句除了遵循上述规则以外,还应注意下列几点：
1.如果陈述句中有第一人称,则变问句时最好要变为第二人称.
例：I usually have lunch at school.
→Do you usually have lunch at school?
My father is playing soccer.
→Is your father playing soccer?
2.如果陈述句中有some,则变问句时往往要变成any .
例：There is some water on the playground.
→Is there any water on the playground?
3.复合句变一般疑问句通常只变主句,从句不变.
例：I know he comes from Canada.
→Do you know he comes from Canada?
4．如果句中含有实义动词have且表示“有”时,除借do外,也可将其直接提到句首.
例：I have some friends in America.
→Have you any friends in America?/Do you have any friends in America?
三.一般疑问句的回答
一般疑问句往往采用简短回答,共由三部分（三个单词）组成,对这三部分（三个单词）的确定可以概括例下：
1.第一个词：不是Yes就是No（有时根据语气的不同,Yes可由Sure,Certainly,Of course等代替.NO可由sorry 代替.）
2.第二个词：问谁答谁.即答语中的主语须与问句的主语一致（但必须用主格代词）.
例：Does she clean her room every day?Yes,she does.
Is Anna′s father a doctor?No,he isn′t.
如果主语是 this that,回答时用 it 代替,如果问句中主语these,those,回答时用 they′ 代替.
3.第三个词：用什么问,用什么答.即沿用问句中的引导词.
Can Jim play soccer?Yes,he can.
Does Mr Bean speak English?Yes,he does.
需要注意问题：
（1）用 may 引导的问句,肯定回答用may,否定回答用 can′t 或mustn′t,
May I go to the park now?
Yes,you may./No,you mustn′t.
（2）用 must 引导的问句,肯定回答用 must,否定回答用needn′t.
例：Must I wash my clothes now?
Yes,you must./No,you needn′t.
4．用No开头作否定回答时,结尾要加上 not.因为回答必须是三部分,所以否定回答必须缩写,而肯定回答不能缩写.
例:Did Thomas come here yesterday?
Yes,he did./ No ,he didn′t.
Is Lin Lin in Class
Yes,she is./No,she isn′t.或（No,she′s not）.
四、总结：将陈述句改成一般疑问句的方法：三步法
1、有be动词,则把be动词放在句首,剩下的照抄,（some 改成any,I改成you,my改成your,）句点改成问号.
2、有情态动词,则把can,shall,will等放到句首,剩下的照抄,（some 改成any,I改成you,my改成your,）句点改成问号.
3、没有be动词,也没有情态动词的,则将助动词Do/Does/Did放到在句首,谓语动词变回原形,剩下的照抄,（some 改成any,I改成you,my改成your,）句点改成问号.