英语的单数变复数

these are my friends
those are his watches
are then your parents
are they his family photos
they are men
we are americans
they are orange oranges
they are happy families
they are apple trees
there are women doctors in the office

is she your parent?有这么说的吗？
Is she your mother?
parent一般都指父母，用复数
is it his family photo?
Is it a photo of his family?
it is an orange orange ?嘛意思？

this is my friend 正确
that is his watch 正确
is she your parent? 语法正确，但一般不这么说。
is it his family photo? 正确
he is a man 正确
i am an american正确
it is an orange orange正确
it is a happy family 正确
it is an apple tree 正确
there is a woman doctor in the office 正确！！

相信我！我是说，在不牵扯“单数变复数的情况下”你那些句子写得都对！
你把自己做的发上来嘛，还不好意思啊？呵呵。发上来我们给你指点。