Question

连词saw,teacher,speaking,the,were,you,i,while,you,to

saw,teacher,speaking,the,were,you,i,while,you,to
while,to,was,i,school,i,in,saw,a,walking,a,cat,tree
you,nine,were,last,what,at,morning,o'clock,Sunday,doing

Answer 1

1,While you were talking to the teacher,I saw you.
2,I saw a cat in the tree while I was walking to school.
3,What were you doing at nine o'clock last Sunday morning?

Answer 2

1\I saw you while you were speaking to your teacher.
2\I saw a cat in a tree while I was walking to school.
3\What were you doning at nine o'clock last Sunday moring?

Answer 3

I saw you while you were speaking to the teacher(you were speaking to the teacher while i saw you)
While i was walking to shcool i saw a cat in a tree.（A cat in a tree while i was walking to school)
while引导的从句可以前后互相置换，因为两个动作是同时发生的。

what were you doing at nine o'clock last sunday moning

Answer 4

I saw you while you were speaking to your teacher.
I saw a cat in a tree while I was walking to school.
What were you doing at nine o'clock last Sunday?