1 What they do is teaching English .(单数句子)
2.The lady who is over there is our English teachers.(who)
3.Am I a new pupil ? No,you are not.(一般疑问句,否定回答)
4.Linda is what his sister's name is .(what)
5.THe class which John and Jim are in is Class 3.(which)
6.Are those nice pictures? Yes ,they are(一般疑问句,肯定回答)
7.Japan is where My sister is form .(where)